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authorCVS to git conversion script <webmaster@postgresql.org>2002-06-20 20:29:55 +0000
committerCVS to git conversion script <webmaster@postgresql.org>2002-06-20 20:29:55 +0000
commit05dedace84ef8c93fea5309c3ac55f889011429b (patch)
tree4c7f513afbbc03060039a165d1770e11be711773 /src/backend/utils/adt/selfuncs.c
parentd84fe82230c593f3dc5d7f427849b99d1efa8a0a (diff)
This commit was manufactured by cvs2git to create branch 'ecpg_big_bison'.
Sprout from master 2002-06-20 20:29:54 UTC Bruce Momjian <bruce@momjian.us> 'Update copyright to 2002.' 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src/include/storage/buf.h src/include/storage/buf_internals.h src/include/storage/buffile.h src/include/storage/bufmgr.h src/include/storage/bufpage.h src/include/storage/fd.h src/include/storage/freespace.h src/include/storage/ipc.h src/include/storage/item.h src/include/storage/itemid.h src/include/storage/itempos.h src/include/storage/itemptr.h src/include/storage/large_object.h src/include/storage/lmgr.h src/include/storage/lock.h src/include/storage/lwlock.h src/include/storage/off.h src/include/storage/page.h src/include/storage/pg_sema.h src/include/storage/pg_shmem.h src/include/storage/pmsignal.h src/include/storage/pos.h src/include/storage/proc.h src/include/storage/relfilenode.h src/include/storage/s_lock.h src/include/storage/shmem.h src/include/storage/sinval.h src/include/storage/sinvaladt.h src/include/storage/smgr.h src/include/storage/spin.h src/include/strdup.h src/include/tcop/dest.h src/include/tcop/fastpath.h src/include/tcop/pquery.h src/include/tcop/tcopdebug.h src/include/tcop/tcopprot.h src/include/tcop/utility.h src/include/utils/acl.h src/include/utils/array.h src/include/utils/ascii.h src/include/utils/bit.h src/include/utils/builtins.h src/include/utils/cash.h src/include/utils/catcache.h src/include/utils/date.h src/include/utils/datetime.h src/include/utils/datum.h src/include/utils/dynahash.h src/include/utils/dynamic_loader.h src/include/utils/elog.h src/include/utils/exc.h src/include/utils/excid.h src/include/utils/fcache.h src/include/utils/fmgrtab.h src/include/utils/formatting.h src/include/utils/geo_decls.h src/include/utils/guc.h src/include/utils/hsearch.h src/include/utils/inet.h src/include/utils/int8.h src/include/utils/inval.h src/include/utils/logtape.h src/include/utils/lsyscache.h src/include/utils/memutils.h src/include/utils/nabstime.h src/include/utils/numeric.h src/include/utils/palloc.h src/include/utils/pg_crc.h src/include/utils/pg_locale.h src/include/utils/pg_lzcompress.h src/include/utils/portal.h src/include/utils/ps_status.h src/include/utils/rel.h src/include/utils/relcache.h src/include/utils/selfuncs.h src/include/utils/sets.h src/include/utils/syscache.h src/include/utils/timestamp.h src/include/utils/tqual.h src/include/utils/tuplesort.h src/include/utils/tuplestore.h src/include/utils/varbit.h src/interfaces/Makefile src/interfaces/cli/example1.c src/interfaces/cli/example2.c src/interfaces/cli/sqlcli.h src/interfaces/jdbc/CHANGELOG src/interfaces/jdbc/Implementation src/interfaces/jdbc/Makefile src/interfaces/jdbc/README src/interfaces/jdbc/build.xml src/interfaces/jdbc/example/ImageViewer.java src/interfaces/jdbc/example/Unicode.java src/interfaces/jdbc/example/basic.java src/interfaces/jdbc/example/blobtest.java src/interfaces/jdbc/example/corba/StockClient.java src/interfaces/jdbc/example/corba/StockDB.java src/interfaces/jdbc/example/corba/StockDispenserImpl.java src/interfaces/jdbc/example/corba/StockItemImpl.java src/interfaces/jdbc/example/corba/StockServer.java src/interfaces/jdbc/example/corba/readme src/interfaces/jdbc/example/corba/stock.idl src/interfaces/jdbc/example/corba/stock.sql src/interfaces/jdbc/example/datestyle.java src/interfaces/jdbc/example/metadata.java src/interfaces/jdbc/example/psql.java src/interfaces/jdbc/example/threadsafe.java src/interfaces/jdbc/jdbc.jpx src/interfaces/jdbc/org/postgresql/Connection.java src/interfaces/jdbc/org/postgresql/Driver.java.in src/interfaces/jdbc/org/postgresql/Field.java src/interfaces/jdbc/org/postgresql/PG_Stream.java src/interfaces/jdbc/org/postgresql/PostgresqlDataSource.java src/interfaces/jdbc/org/postgresql/ResultSet.java src/interfaces/jdbc/org/postgresql/Statement.java src/interfaces/jdbc/org/postgresql/core/BytePoolDim1.java src/interfaces/jdbc/org/postgresql/core/BytePoolDim2.java src/interfaces/jdbc/org/postgresql/core/Encoding.java src/interfaces/jdbc/org/postgresql/core/MemoryPool.java src/interfaces/jdbc/org/postgresql/core/ObjectPool.java src/interfaces/jdbc/org/postgresql/core/QueryExecutor.java src/interfaces/jdbc/org/postgresql/core/SimpleObjectPool.java src/interfaces/jdbc/org/postgresql/core/StartupPacket.java src/interfaces/jdbc/org/postgresql/errors.properties src/interfaces/jdbc/org/postgresql/errors_de.properties src/interfaces/jdbc/org/postgresql/errors_fr.properties src/interfaces/jdbc/org/postgresql/errors_it.properties src/interfaces/jdbc/org/postgresql/errors_nl.properties src/interfaces/jdbc/org/postgresql/errors_zh_TW.properties src/interfaces/jdbc/org/postgresql/fastpath/Fastpath.java src/interfaces/jdbc/org/postgresql/fastpath/FastpathArg.java src/interfaces/jdbc/org/postgresql/geometric/PGbox.java src/interfaces/jdbc/org/postgresql/geometric/PGcircle.java src/interfaces/jdbc/org/postgresql/geometric/PGline.java src/interfaces/jdbc/org/postgresql/geometric/PGlseg.java src/interfaces/jdbc/org/postgresql/geometric/PGpath.java src/interfaces/jdbc/org/postgresql/geometric/PGpoint.java src/interfaces/jdbc/org/postgresql/geometric/PGpolygon.java src/interfaces/jdbc/org/postgresql/jdbc1/CallableStatement.java src/interfaces/jdbc/org/postgresql/jdbc1/Connection.java src/interfaces/jdbc/org/postgresql/jdbc1/DatabaseMetaData.java src/interfaces/jdbc/org/postgresql/jdbc1/PreparedStatement.java src/interfaces/jdbc/org/postgresql/jdbc1/ResultSet.java src/interfaces/jdbc/org/postgresql/jdbc1/ResultSetMetaData.java src/interfaces/jdbc/org/postgresql/jdbc1/Statement.java src/interfaces/jdbc/org/postgresql/jdbc2/Array.java src/interfaces/jdbc/org/postgresql/jdbc2/CallableStatement.java src/interfaces/jdbc/org/postgresql/jdbc2/Connection.java src/interfaces/jdbc/org/postgresql/jdbc2/DatabaseMetaData.java src/interfaces/jdbc/org/postgresql/jdbc2/PBatchUpdateException.java src/interfaces/jdbc/org/postgresql/jdbc2/PreparedStatement.java src/interfaces/jdbc/org/postgresql/jdbc2/ResultSet.java src/interfaces/jdbc/org/postgresql/jdbc2/ResultSetMetaData.java src/interfaces/jdbc/org/postgresql/jdbc2/Statement.java src/interfaces/jdbc/org/postgresql/jdbc2/UpdateableResultSet.java src/interfaces/jdbc/org/postgresql/largeobject/BlobInputStream.java src/interfaces/jdbc/org/postgresql/largeobject/BlobOutputStream.java src/interfaces/jdbc/org/postgresql/largeobject/LargeObject.java src/interfaces/jdbc/org/postgresql/largeobject/LargeObjectManager.java src/interfaces/jdbc/org/postgresql/largeobject/PGblob.java src/interfaces/jdbc/org/postgresql/largeobject/PGclob.java src/interfaces/jdbc/org/postgresql/test/JDBC2Tests.java src/interfaces/jdbc/org/postgresql/test/README src/interfaces/jdbc/org/postgresql/test/jdbc2/ANTTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/BatchExecuteTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/BlobTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/ConnectionTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/DatabaseMetaDataTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/DateTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/DriverTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/EncodingTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/JBuilderTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/MiscTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/ResultSetTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/TimeTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/TimestampTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/UpdateableResultTest.java src/interfaces/jdbc/org/postgresql/util/MD5Digest.java src/interfaces/jdbc/org/postgresql/util/MessageTranslator.java src/interfaces/jdbc/org/postgresql/util/PGbytea.java src/interfaces/jdbc/org/postgresql/util/PGmoney.java src/interfaces/jdbc/org/postgresql/util/PGobject.java src/interfaces/jdbc/org/postgresql/util/PGtokenizer.java src/interfaces/jdbc/org/postgresql/util/PSQLException.java src/interfaces/jdbc/org/postgresql/util/Serialize.java src/interfaces/jdbc/org/postgresql/util/UnixCrypt.java src/interfaces/jdbc/org/postgresql/xa/ClientConnection.java src/interfaces/jdbc/org/postgresql/xa/TwoPhaseConnection.java src/interfaces/jdbc/org/postgresql/xa/TxConnection.java src/interfaces/jdbc/org/postgresql/xa/XAConnectionImpl.java src/interfaces/jdbc/org/postgresql/xa/XADataSourceImpl.java src/interfaces/jdbc/utils/CheckVersion.java src/interfaces/jdbc/utils/buildDriver src/interfaces/jdbc/utils/changelog.pl src/interfaces/libpgeasy/Makefile src/interfaces/libpgeasy/README src/interfaces/libpgeasy/examples/Makefile src/interfaces/libpgeasy/examples/pginsert.c src/interfaces/libpgeasy/examples/pgmultiresult.c src/interfaces/libpgeasy/examples/pgnulltest.c src/interfaces/libpgeasy/examples/pgwordcount.c src/interfaces/libpgeasy/halt.c src/interfaces/libpgeasy/halt.h src/interfaces/libpgeasy/libpgeasy.c src/interfaces/libpgeasy/libpgeasy.h src/interfaces/libpgtcl/Makefile src/interfaces/libpgtcl/README 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src/interfaces/libpq/ru.po src/interfaces/libpq/sv.po src/interfaces/libpq/win32.c src/interfaces/libpq/win32.h src/interfaces/libpq/win32.mak src/interfaces/libpq/zh_CN.po src/interfaces/libpq/zh_TW.po src/interfaces/libpq++/CHANGES src/interfaces/libpq++/Makefile src/interfaces/libpq++/README src/interfaces/libpq++/TODO src/interfaces/libpq++/examples/Makefile src/interfaces/libpq++/examples/testlibpq0.cc src/interfaces/libpq++/examples/testlibpq1.cc src/interfaces/libpq++/examples/testlibpq2.cc src/interfaces/libpq++/examples/testlibpq2.sql src/interfaces/libpq++/examples/testlibpq3.cc src/interfaces/libpq++/examples/testlibpq3.sql src/interfaces/libpq++/examples/testlibpq4.cc src/interfaces/libpq++/examples/testlibpq4.sql src/interfaces/libpq++/examples/testlibpq5.cc src/interfaces/libpq++/examples/testlibpq5.sql src/interfaces/libpq++/examples/testlibpq6.cc src/interfaces/libpq++/examples/testlo.cc src/interfaces/libpq++/libpq++.h src/interfaces/libpq++/libpq++dll.rc src/interfaces/libpq++/pgconnection.cc src/interfaces/libpq++/pgconnection.h src/interfaces/libpq++/pgcursordb.cc src/interfaces/libpq++/pgcursordb.h src/interfaces/libpq++/pgdatabase.cc src/interfaces/libpq++/pgdatabase.h src/interfaces/libpq++/pglobject.cc src/interfaces/libpq++/pglobject.h src/interfaces/libpq++/pgtransdb.cc src/interfaces/libpq++/pgtransdb.h src/interfaces/libpq++/win32.mak src/interfaces/odbc/GNUmakefile src/interfaces/odbc/bind.c src/interfaces/odbc/bind.h src/interfaces/odbc/columninfo.c src/interfaces/odbc/columninfo.h src/interfaces/odbc/connection.c src/interfaces/odbc/connection.h src/interfaces/odbc/convert.c src/interfaces/odbc/convert.h src/interfaces/odbc/descriptor.h src/interfaces/odbc/dlg_specific.c src/interfaces/odbc/dlg_specific.h src/interfaces/odbc/dlg_wingui.c src/interfaces/odbc/drvconn.c src/interfaces/odbc/environ.c src/interfaces/odbc/environ.h src/interfaces/odbc/execute.c src/interfaces/odbc/gpps.c src/interfaces/odbc/gpps.h src/interfaces/odbc/info.c src/interfaces/odbc/info30.c src/interfaces/odbc/iodbc.h src/interfaces/odbc/isql.h src/interfaces/odbc/isqlext.h src/interfaces/odbc/license.txt src/interfaces/odbc/lobj.c src/interfaces/odbc/lobj.h src/interfaces/odbc/md5.c src/interfaces/odbc/md5.h src/interfaces/odbc/misc.c src/interfaces/odbc/misc.h src/interfaces/odbc/multibyte.c src/interfaces/odbc/multibyte.h src/interfaces/odbc/notice.txt src/interfaces/odbc/odbc.sql src/interfaces/odbc/odbcapi.c src/interfaces/odbc/odbcapi25w.c src/interfaces/odbc/odbcapi30.c src/interfaces/odbc/odbcapi30w.c src/interfaces/odbc/odbcapiw.c src/interfaces/odbc/odbcinst.ini src/interfaces/odbc/options.c src/interfaces/odbc/parse.c src/interfaces/odbc/pgapi30.c src/interfaces/odbc/pgapifunc.h src/interfaces/odbc/pgtypes.c src/interfaces/odbc/pgtypes.h src/interfaces/odbc/psqlodbc.c src/interfaces/odbc/psqlodbc.h src/interfaces/odbc/psqlodbc.rc src/interfaces/odbc/psqlodbc.reg src/interfaces/odbc/psqlodbc30.reg src/interfaces/odbc/psqlodbc30w.reg src/interfaces/odbc/psqlodbc_api30.def src/interfaces/odbc/psqlodbc_api30w.def src/interfaces/odbc/psqlodbc_apiw.def src/interfaces/odbc/psqlodbc_win32.def src/interfaces/odbc/qresult.c src/interfaces/odbc/qresult.h src/interfaces/odbc/readme.txt src/interfaces/odbc/resource.h src/interfaces/odbc/results.c src/interfaces/odbc/setup.c src/interfaces/odbc/setup.rul src/interfaces/odbc/socket.c src/interfaces/odbc/socket.h src/interfaces/odbc/statement.c src/interfaces/odbc/statement.h src/interfaces/odbc/tuple.c src/interfaces/odbc/tuple.h src/interfaces/odbc/tuplelist.c src/interfaces/odbc/tuplelist.h src/interfaces/odbc/version.h src/interfaces/odbc/win32.mak src/interfaces/odbc/win32_30.mak src/interfaces/odbc/win32_30w.mak src/interfaces/odbc/win32w.mak src/interfaces/odbc/win_md5.c src/interfaces/odbc/win_setup.h src/interfaces/odbc/win_unicode.c src/interfaces/perl5/Changes src/interfaces/perl5/GNUmakefile src/interfaces/perl5/MANIFEST src/interfaces/perl5/Makefile.PL src/interfaces/perl5/Pg.pm src/interfaces/perl5/Pg.xs src/interfaces/perl5/README src/interfaces/perl5/examples/ApachePg.pl src/interfaces/perl5/examples/example.newstyle src/interfaces/perl5/examples/example.oldstyle src/interfaces/perl5/ppport.h src/interfaces/perl5/test.pl src/interfaces/perl5/typemap src/interfaces/python/Announce src/interfaces/python/ChangeLog src/interfaces/python/GNUmakefile src/interfaces/python/PyGreSQL.spec src/interfaces/python/README src/interfaces/python/README.linux src/interfaces/python/Setup.in.raw src/interfaces/python/pg.py src/interfaces/python/pgdb.py src/interfaces/python/pgmodule.c src/interfaces/python/setup.py src/interfaces/python/tutorial/advanced.py src/interfaces/python/tutorial/basics.py src/interfaces/python/tutorial/func.py src/interfaces/python/tutorial/syscat.py src/interfaces/ssl/client.conf src/interfaces/ssl/mkcert.sh src/interfaces/ssl/pgkeygen.sh src/interfaces/ssl/root.conf src/interfaces/ssl/server.conf src/makefiles/Makefile.aix src/makefiles/Makefile.beos src/makefiles/Makefile.bsdi src/makefiles/Makefile.darwin src/makefiles/Makefile.dgux src/makefiles/Makefile.freebsd src/makefiles/Makefile.hpux src/makefiles/Makefile.irix5 src/makefiles/Makefile.linux src/makefiles/Makefile.netbsd src/makefiles/Makefile.openbsd src/makefiles/Makefile.osf src/makefiles/Makefile.qnx4 src/makefiles/Makefile.sco src/makefiles/Makefile.solaris src/makefiles/Makefile.sunos4 src/makefiles/Makefile.svr4 src/makefiles/Makefile.ultrix4 src/makefiles/Makefile.univel src/makefiles/Makefile.unixware src/makefiles/Makefile.win src/nls-global.mk src/pl/Makefile src/pl/plperl/GNUmakefile src/pl/plperl/README src/pl/plperl/SPI.xs src/pl/plperl/eloglvl.c src/pl/plperl/eloglvl.h src/pl/plperl/plperl.c src/pl/plperl/ppport.h src/pl/plpgsql/Makefile src/pl/plpgsql/src/.cvsignore src/pl/plpgsql/src/INSTALL src/pl/plpgsql/src/Makefile src/pl/plpgsql/src/gram.y src/pl/plpgsql/src/pl_comp.c 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src/test/bench/query01 src/test/bench/query02 src/test/bench/query03 src/test/bench/query04 src/test/bench/query05 src/test/bench/query06 src/test/bench/query07 src/test/bench/query08 src/test/bench/query09 src/test/bench/query10 src/test/bench/query11 src/test/bench/query12 src/test/bench/query13 src/test/bench/query14 src/test/bench/query15 src/test/bench/query16 src/test/bench/query17 src/test/bench/query18 src/test/bench/query19 src/test/bench/query20 src/test/bench/query21 src/test/bench/query22 src/test/bench/query23 src/test/bench/query24 src/test/bench/query25 src/test/bench/query26 src/test/bench/query27 src/test/bench/query28 src/test/bench/query29 src/test/bench/query30 src/test/bench/query31 src/test/bench/query32 src/test/bench/runwisc.sh src/test/bench/wholebench.sh src/test/examples/Makefile src/test/examples/testlibpq.c src/test/examples/testlibpq2.c src/test/examples/testlibpq2.sql src/test/examples/testlibpq3.c src/test/examples/testlibpq3.sql src/test/examples/testlibpq4.c src/test/examples/testlo.c src/test/locale/Makefile src/test/locale/README src/test/locale/de_DE.ISO8859-1/Makefile src/test/locale/de_DE.ISO8859-1/README src/test/locale/de_DE.ISO8859-1/expected/de-ctype.out src/test/locale/de_DE.ISO8859-1/expected/test-de-char.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-select.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-sort.out src/test/locale/de_DE.ISO8859-1/expected/test-de-text.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-upper-char.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-upper-text.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-upper-varchar.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-varchar.sql.out src/test/locale/de_DE.ISO8859-1/runall src/test/locale/de_DE.ISO8859-1/test-de-select.sql.in src/test/locale/de_DE.ISO8859-1/test-de-sort.in src/test/locale/de_DE.ISO8859-1/test-de-upper.sql.in src/test/locale/de_DE.ISO8859-1/test-de.sql.in src/test/locale/gr_GR.ISO8859-7/Makefile src/test/locale/gr_GR.ISO8859-7/README src/test/locale/gr_GR.ISO8859-7/expected/gr-ctype.out src/test/locale/gr_GR.ISO8859-7/expected/test-gr-char.sql.out src/test/locale/gr_GR.ISO8859-7/expected/test-gr-select.sql.out src/test/locale/gr_GR.ISO8859-7/expected/test-gr-sort.out src/test/locale/gr_GR.ISO8859-7/expected/test-gr-text.sql.out src/test/locale/gr_GR.ISO8859-7/expected/test-gr-varchar.sql.out src/test/locale/gr_GR.ISO8859-7/runall src/test/locale/gr_GR.ISO8859-7/test-gr-select.sql.in src/test/locale/gr_GR.ISO8859-7/test-gr-sort.in src/test/locale/gr_GR.ISO8859-7/test-gr.sql.in src/test/locale/koi8-r/Makefile src/test/locale/koi8-r/expected/koi8-ctype.out src/test/locale/koi8-r/expected/test-koi8-char.sql.out src/test/locale/koi8-r/expected/test-koi8-select.sql.out src/test/locale/koi8-r/expected/test-koi8-sort.out src/test/locale/koi8-r/expected/test-koi8-text.sql.out src/test/locale/koi8-r/expected/test-koi8-varchar.sql.out src/test/locale/koi8-r/runall src/test/locale/koi8-r/test-koi8-select.sql.in src/test/locale/koi8-r/test-koi8-sort.in src/test/locale/koi8-r/test-koi8.sql.in src/test/locale/koi8-to-win1251/Makefile src/test/locale/koi8-to-win1251/README src/test/locale/koi8-to-win1251/expected/test-koi8-char.sql.out src/test/locale/koi8-to-win1251/expected/test-koi8-select.sql.out src/test/locale/koi8-to-win1251/expected/test-koi8-sort.out src/test/locale/koi8-to-win1251/expected/test-koi8-text.sql.out src/test/locale/koi8-to-win1251/expected/test-koi8-varchar.sql.out src/test/locale/koi8-to-win1251/runall src/test/locale/koi8-to-win1251/test-koi8-select.sql.in src/test/locale/koi8-to-win1251/test-koi8-sort.in src/test/locale/koi8-to-win1251/test-koi8.sql.in src/test/locale/sort-test.pl src/test/locale/sort-test.py src/test/locale/test-ctype.c src/test/locale/test-pgsql-locale.c src/test/mb/README src/test/mb/expected/big5.out src/test/mb/expected/euc_cn.out src/test/mb/expected/euc_jp.out src/test/mb/expected/euc_kr.out src/test/mb/expected/euc_tw.out src/test/mb/expected/mule_internal.out src/test/mb/expected/sjis.out src/test/mb/expected/unicode.out src/test/mb/mbregress.sh src/test/mb/sql/big5.sql src/test/mb/sql/euc_cn.sql src/test/mb/sql/euc_jp.sql src/test/mb/sql/euc_kr.sql src/test/mb/sql/euc_tw.sql src/test/mb/sql/mule_internal.sql src/test/mb/sql/sjis.sql src/test/mb/sql/unicode.sql src/test/performance/results/PgSQL.970926 src/test/performance/runtests.pl src/test/performance/sqls/connection src/test/performance/sqls/crtsimple src/test/performance/sqls/crtsimpleidx src/test/performance/sqls/drpsimple src/test/performance/sqls/inssimple src/test/performance/sqls/inssimple.data src/test/performance/sqls/orbsimple src/test/performance/sqls/slcsimple src/test/performance/sqls/slcsimple.data src/test/performance/sqls/vacuum src/test/performance/start-pgsql.sh src/test/regress/GNUmakefile src/test/regress/Makefile src/test/regress/README src/test/regress/data/agg.data src/test/regress/data/constrf.data src/test/regress/data/constro.data src/test/regress/data/dept.data src/test/regress/data/desc.data src/test/regress/data/emp.data src/test/regress/data/hash.data src/test/regress/data/onek.data src/test/regress/data/person.data src/test/regress/data/real_city.data src/test/regress/data/rect.data src/test/regress/data/streets.data src/test/regress/data/stud_emp.data src/test/regress/data/student.data src/test/regress/data/tenk.data src/test/regress/expected/abstime-solaris-1947.out src/test/regress/expected/abstime.out src/test/regress/expected/aggregates.out src/test/regress/expected/alter_table.out src/test/regress/expected/arrays.out src/test/regress/expected/bit.out src/test/regress/expected/boolean.out src/test/regress/expected/box.out src/test/regress/expected/btree_index.out src/test/regress/expected/case.out src/test/regress/expected/char.out src/test/regress/expected/char_1.out src/test/regress/expected/circle.out src/test/regress/expected/comments.out src/test/regress/expected/create_aggregate.out src/test/regress/expected/create_index.out src/test/regress/expected/create_misc.out src/test/regress/expected/create_operator.out src/test/regress/expected/create_table.out src/test/regress/expected/create_type.out src/test/regress/expected/create_view.out src/test/regress/expected/date.out src/test/regress/expected/domain.out src/test/regress/expected/errors.out src/test/regress/expected/euc_cn.out src/test/regress/expected/euc_jp.out src/test/regress/expected/euc_kr.out src/test/regress/expected/euc_tw.out src/test/regress/expected/float4-exp-three-digits.out src/test/regress/expected/float4.out src/test/regress/expected/float8-exp-three-digits.out src/test/regress/expected/float8-fp-exception.out src/test/regress/expected/float8-small-is-zero.out src/test/regress/expected/float8.out src/test/regress/expected/foreign_key.out src/test/regress/expected/geometry-alpha-precision.out src/test/regress/expected/geometry-bsdi-precision.out src/test/regress/expected/geometry-i86-gnulibc.out src/test/regress/expected/geometry-intel-beos.out src/test/regress/expected/geometry-irix.out src/test/regress/expected/geometry-positive-zeros-bsd.out src/test/regress/expected/geometry-positive-zeros.out src/test/regress/expected/geometry-powerpc-aix4.out src/test/regress/expected/geometry-powerpc-darwin.out src/test/regress/expected/geometry-powerpc-linux-gnulibc1.out src/test/regress/expected/geometry-solaris-i386-pc.out src/test/regress/expected/geometry-solaris-precision.out src/test/regress/expected/geometry-uw7-cc.out src/test/regress/expected/geometry-uw7-gcc.out src/test/regress/expected/geometry.out src/test/regress/expected/hash_index.out src/test/regress/expected/horology-no-DST-before-1970.out src/test/regress/expected/horology-solaris-1947.out src/test/regress/expected/horology.out src/test/regress/expected/inet.out src/test/regress/expected/inherit.out src/test/regress/expected/insert.out src/test/regress/expected/int2.out src/test/regress/expected/int4.out src/test/regress/expected/int8-exp-three-digits.out src/test/regress/expected/int8.out src/test/regress/expected/interval.out src/test/regress/expected/join.out src/test/regress/expected/limit.out src/test/regress/expected/lseg.out src/test/regress/expected/mule_internal.out src/test/regress/expected/name.out src/test/regress/expected/numeric.out src/test/regress/expected/numeric_big.out src/test/regress/expected/numerology.out src/test/regress/expected/oid.out src/test/regress/expected/oidjoins.out src/test/regress/expected/opr_sanity.out src/test/regress/expected/path.out src/test/regress/expected/plpgsql.out src/test/regress/expected/point.out src/test/regress/expected/polygon.out src/test/regress/expected/portals.out src/test/regress/expected/portals_p2.out src/test/regress/expected/privileges.out src/test/regress/expected/random.out src/test/regress/expected/reltime.out src/test/regress/expected/rules.out src/test/regress/expected/sanity_check.out src/test/regress/expected/select.out src/test/regress/expected/select_distinct.out src/test/regress/expected/select_distinct_on.out src/test/regress/expected/select_having.out src/test/regress/expected/select_having_1.out src/test/regress/expected/select_implicit.out src/test/regress/expected/select_implicit_1.out src/test/regress/expected/select_into.out src/test/regress/expected/select_views.out src/test/regress/expected/select_views_1.out src/test/regress/expected/sql_ascii.out src/test/regress/expected/strings.out src/test/regress/expected/subselect.out src/test/regress/expected/temp.out src/test/regress/expected/text.out src/test/regress/expected/time.out src/test/regress/expected/timestamp.out src/test/regress/expected/timestamptz.out src/test/regress/expected/timetz.out src/test/regress/expected/tinterval-solaris-1947.out src/test/regress/expected/tinterval.out src/test/regress/expected/transactions.out src/test/regress/expected/triggers.out src/test/regress/expected/type_sanity.out src/test/regress/expected/union.out src/test/regress/expected/varchar.out src/test/regress/expected/varchar_1.out src/test/regress/input/constraints.source src/test/regress/input/copy.source src/test/regress/input/create_function_1.source src/test/regress/input/create_function_2.source src/test/regress/input/misc.source src/test/regress/output/constraints.source src/test/regress/output/copy.source src/test/regress/output/create_function_1.source src/test/regress/output/create_function_2.source src/test/regress/output/misc.source src/test/regress/parallel_schedule src/test/regress/pg_regress.sh src/test/regress/regress.c src/test/regress/regressplans.sh src/test/regress/resultmap src/test/regress/serial_schedule src/test/regress/sql/abstime.sql src/test/regress/sql/aggregates.sql src/test/regress/sql/alter_table.sql src/test/regress/sql/arrays.sql src/test/regress/sql/bit.sql src/test/regress/sql/boolean.sql src/test/regress/sql/box.sql src/test/regress/sql/btree_index.sql src/test/regress/sql/case.sql src/test/regress/sql/char.sql src/test/regress/sql/circle.sql src/test/regress/sql/comments.sql src/test/regress/sql/create_aggregate.sql src/test/regress/sql/create_index.sql src/test/regress/sql/create_misc.sql src/test/regress/sql/create_operator.sql src/test/regress/sql/create_table.sql src/test/regress/sql/create_type.sql src/test/regress/sql/create_view.sql src/test/regress/sql/date.sql src/test/regress/sql/domain.sql src/test/regress/sql/drop.sql src/test/regress/sql/errors.sql src/test/regress/sql/euc_cn.sql src/test/regress/sql/euc_jp.sql src/test/regress/sql/euc_kr.sql src/test/regress/sql/euc_tw.sql src/test/regress/sql/float4.sql src/test/regress/sql/float8.sql src/test/regress/sql/foreign_key.sql src/test/regress/sql/geometry.sql src/test/regress/sql/hash_index.sql src/test/regress/sql/horology.sql src/test/regress/sql/inet.sql src/test/regress/sql/inherit.sql src/test/regress/sql/insert.sql src/test/regress/sql/int2.sql src/test/regress/sql/int4.sql src/test/regress/sql/int8.sql src/test/regress/sql/interval.sql src/test/regress/sql/join.sql src/test/regress/sql/limit.sql src/test/regress/sql/lseg.sql src/test/regress/sql/mule_internal.sql src/test/regress/sql/name.sql src/test/regress/sql/numeric.sql src/test/regress/sql/numeric_big.sql src/test/regress/sql/numerology.sql src/test/regress/sql/oid.sql src/test/regress/sql/oidjoins.sql src/test/regress/sql/opr_sanity.sql src/test/regress/sql/path.sql src/test/regress/sql/plpgsql.sql src/test/regress/sql/point.sql src/test/regress/sql/polygon.sql src/test/regress/sql/portals.sql src/test/regress/sql/portals_p2.sql src/test/regress/sql/privileges.sql src/test/regress/sql/random.sql src/test/regress/sql/reltime.sql src/test/regress/sql/rules.sql src/test/regress/sql/sanity_check.sql src/test/regress/sql/select.sql src/test/regress/sql/select_distinct.sql src/test/regress/sql/select_distinct_on.sql src/test/regress/sql/select_having.sql src/test/regress/sql/select_implicit.sql src/test/regress/sql/select_into.sql src/test/regress/sql/select_views.sql src/test/regress/sql/sql_ascii.sql src/test/regress/sql/strings.sql src/test/regress/sql/subselect.sql src/test/regress/sql/temp.sql src/test/regress/sql/text.sql src/test/regress/sql/time.sql src/test/regress/sql/timestamp.sql src/test/regress/sql/timestamptz.sql src/test/regress/sql/timetz.sql src/test/regress/sql/tinterval.sql src/test/regress/sql/transactions.sql src/test/regress/sql/triggers.sql src/test/regress/sql/type_sanity.sql src/test/regress/sql/union.sql src/test/regress/sql/varchar.sql src/tools/RELEASE_CHANGES src/tools/backend/README src/tools/backend/backend_dirs.html src/tools/backend/flow.fig src/tools/backend/flow.gif src/tools/backend/index.html src/tools/ccsym src/tools/copyright src/tools/entab/Makefile src/tools/entab/entab.c src/tools/entab/entab.man src/tools/entab/halt.c src/tools/find_badmacros src/tools/find_static src/tools/find_typedef src/tools/make_ctags src/tools/make_diff/README src/tools/make_diff/cporig src/tools/make_diff/difforig src/tools/make_diff/rmorig src/tools/make_etags src/tools/make_keywords src/tools/make_mkid src/tools/pgcvslog src/tools/pginclude/README src/tools/pginclude/pgcompinclude src/tools/pginclude/pgdefine src/tools/pginclude/pgfixinclude src/tools/pginclude/pgrminclude src/tools/pgindent/README src/tools/pgindent/indent.bsd.patch src/tools/pgindent/pgcppindent src/tools/pgindent/pgindent src/tools/pgindent/pgjindent src/tutorial/Makefile src/tutorial/README src/tutorial/advanced.source src/tutorial/basics.source src/tutorial/beard.c src/tutorial/complex.c src/tutorial/complex.source src/tutorial/funcs.c src/tutorial/funcs.source src/tutorial/funcs_new.c src/tutorial/syscat.source src/utils/Makefile src/utils/README src/utils/dllinit.c src/utils/getopt.c src/utils/strdup.c src/win32.mak
Diffstat (limited to 'src/backend/utils/adt/selfuncs.c')
-rw-r--r--src/backend/utils/adt/selfuncs.c3583
1 files changed, 0 insertions, 3583 deletions
diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c
deleted file mode 100644
index 10fc2d29e03..00000000000
--- a/src/backend/utils/adt/selfuncs.c
+++ /dev/null
@@ -1,3583 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * selfuncs.c
- * Selectivity functions and index cost estimation functions for
- * standard operators and index access methods.
- *
- * Selectivity routines are registered in the pg_operator catalog
- * in the "oprrest" and "oprjoin" attributes.
- *
- * Index cost functions are registered in the pg_am catalog
- * in the "amcostestimate" attribute.
- *
- * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.112 2002/06/20 20:29:38 momjian Exp $
- *
- *-------------------------------------------------------------------------
- */
-
-/*----------
- * Operator selectivity estimation functions are called to estimate the
- * selectivity of WHERE clauses whose top-level operator is their operator.
- * We divide the problem into two cases:
- * Restriction clause estimation: the clause involves vars of just
- * one relation.
- * Join clause estimation: the clause involves vars of multiple rels.
- * Join selectivity estimation is far more difficult and usually less accurate
- * than restriction estimation.
- *
- * When dealing with the inner scan of a nestloop join, we consider the
- * join's joinclauses as restriction clauses for the inner relation, and
- * treat vars of the outer relation as parameters (a/k/a constants of unknown
- * values). So, restriction estimators need to be able to accept an argument
- * telling which relation is to be treated as the variable.
- *
- * The call convention for a restriction estimator (oprrest function) is
- *
- * Selectivity oprrest (Query *root,
- * Oid operator,
- * List *args,
- * int varRelid);
- *
- * root: general information about the query (rtable and RelOptInfo lists
- * are particularly important for the estimator).
- * operator: OID of the specific operator in question.
- * args: argument list from the operator clause.
- * varRelid: if not zero, the relid (rtable index) of the relation to
- * be treated as the variable relation. May be zero if the args list
- * is known to contain vars of only one relation.
- *
- * This is represented at the SQL level (in pg_proc) as
- *
- * float8 oprrest (opaque, oid, opaque, int4);
- *
- * The call convention for a join estimator (oprjoin function) is similar
- * except that varRelid is not needed:
- *
- * Selectivity oprjoin (Query *root,
- * Oid operator,
- * List *args);
- *
- * float8 oprjoin (opaque, oid, opaque);
- *----------
- */
-
-#include "postgres.h"
-
-#include <ctype.h>
-#include <math.h>
-#include <locale.h>
-
-#include "access/heapam.h"
-#include "catalog/catname.h"
-#include "catalog/pg_namespace.h"
-#include "catalog/pg_operator.h"
-#include "catalog/pg_proc.h"
-#include "catalog/pg_statistic.h"
-#include "catalog/pg_type.h"
-#include "mb/pg_wchar.h"
-#include "nodes/makefuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/cost.h"
-#include "optimizer/pathnode.h"
-#include "optimizer/plancat.h"
-#include "optimizer/prep.h"
-#include "parser/parse_func.h"
-#include "parser/parse_oper.h"
-#include "parser/parsetree.h"
-#include "utils/builtins.h"
-#include "utils/date.h"
-#include "utils/datum.h"
-#include "utils/int8.h"
-#include "utils/lsyscache.h"
-#include "utils/pg_locale.h"
-#include "utils/selfuncs.h"
-#include "utils/syscache.h"
-
-
-/*
- * Note: the default selectivity estimates are not chosen entirely at random.
- * We want them to be small enough to ensure that indexscans will be used if
- * available, for typical table densities of ~100 tuples/page. Thus, for
- * example, 0.01 is not quite small enough, since that makes it appear that
- * nearly all pages will be hit anyway. Also, since we sometimes estimate
- * eqsel as 1/num_distinct, we probably want DEFAULT_NUM_DISTINCT to equal
- * 1/DEFAULT_EQ_SEL.
- */
-
-/* default selectivity estimate for equalities such as "A = b" */
-#define DEFAULT_EQ_SEL 0.005
-
-/* default selectivity estimate for inequalities such as "A < b" */
-#define DEFAULT_INEQ_SEL (1.0 / 3.0)
-
-/* default selectivity estimate for pattern-match operators such as LIKE */
-#define DEFAULT_MATCH_SEL 0.005
-
-/* default number of distinct values in a table */
-#define DEFAULT_NUM_DISTINCT 200
-
-/* default selectivity estimate for boolean and null test nodes */
-#define DEFAULT_UNK_SEL 0.005
-#define DEFAULT_NOT_UNK_SEL (1.0 - DEFAULT_UNK_SEL)
-#define DEFAULT_BOOL_SEL 0.5
-
-/*
- * Clamp a computed probability estimate (which may suffer from roundoff or
- * estimation errors) to valid range. Argument must be a float variable.
- */
-#define CLAMP_PROBABILITY(p) \
- do { \
- if (p < 0.0) \
- p = 0.0; \
- else if (p > 1.0) \
- p = 1.0; \
- } while (0)
-
-
-static bool get_var_maximum(Query *root, Var *var, Oid sortop, Datum *max);
-static bool convert_to_scalar(Datum value, Oid valuetypid, double *scaledvalue,
- Datum lobound, Datum hibound, Oid boundstypid,
- double *scaledlobound, double *scaledhibound);
-static double convert_numeric_to_scalar(Datum value, Oid typid);
-static void convert_string_to_scalar(unsigned char *value,
- double *scaledvalue,
- unsigned char *lobound,
- double *scaledlobound,
- unsigned char *hibound,
- double *scaledhibound);
-static void convert_bytea_to_scalar(Datum value,
- double *scaledvalue,
- Datum lobound,
- double *scaledlobound,
- Datum hibound,
- double *scaledhibound);
-static double convert_one_string_to_scalar(unsigned char *value,
- int rangelo, int rangehi);
-static double convert_one_bytea_to_scalar(unsigned char *value, int valuelen,
- int rangelo, int rangehi);
-static unsigned char *convert_string_datum(Datum value, Oid typid);
-static double convert_timevalue_to_scalar(Datum value, Oid typid);
-static double get_att_numdistinct(Query *root, Var *var,
- Form_pg_statistic stats);
-static bool get_restriction_var(List *args, int varRelid,
- Var **var, Node **other,
- bool *varonleft);
-static void get_join_vars(List *args, Var **var1, Var **var2);
-static Selectivity prefix_selectivity(Query *root, Var *var, char *prefix);
-static Selectivity pattern_selectivity(char *patt, Pattern_Type ptype);
-static bool string_lessthan(const char *str1, const char *str2,
- Oid datatype);
-static Oid find_operator(const char *opname, Oid datatype);
-static Datum string_to_datum(const char *str, Oid datatype);
-static Const *string_to_const(const char *str, Oid datatype);
-
-
-/*
- * eqsel - Selectivity of "=" for any data types.
- *
- * Note: this routine is also used to estimate selectivity for some
- * operators that are not "=" but have comparable selectivity behavior,
- * such as "~=" (geometric approximate-match). Even for "=", we must
- * keep in mind that the left and right datatypes may differ.
- */
-Datum
-eqsel(PG_FUNCTION_ARGS)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
- Oid operator = PG_GETARG_OID(1);
- List *args = (List *) PG_GETARG_POINTER(2);
- int varRelid = PG_GETARG_INT32(3);
- Var *var;
- Node *other;
- bool varonleft;
- Oid relid;
- HeapTuple statsTuple;
- Datum *values;
- int nvalues;
- float4 *numbers;
- int nnumbers;
- double selec;
-
- /*
- * If expression is not var = something or something = var for a
- * simple var of a real relation (no subqueries, for now), then punt
- * and return a default estimate.
- */
- if (!get_restriction_var(args, varRelid,
- &var, &other, &varonleft))
- PG_RETURN_FLOAT8(DEFAULT_EQ_SEL);
- relid = getrelid(var->varno, root->rtable);
- if (relid == InvalidOid)
- PG_RETURN_FLOAT8(DEFAULT_EQ_SEL);
-
- /*
- * If the something is a NULL constant, assume operator is strict and
- * return zero, ie, operator will never return TRUE.
- */
- if (IsA(other, Const) &&((Const *) other)->constisnull)
- PG_RETURN_FLOAT8(0.0);
-
- /* get stats for the attribute, if available */
- statsTuple = SearchSysCache(STATRELATT,
- ObjectIdGetDatum(relid),
- Int16GetDatum(var->varattno),
- 0, 0);
- if (HeapTupleIsValid(statsTuple))
- {
- Form_pg_statistic stats;
-
- stats = (Form_pg_statistic) GETSTRUCT(statsTuple);
-
- if (IsA(other, Const))
- {
- /* Var is being compared to a known non-null constant */
- Datum constval = ((Const *) other)->constvalue;
- bool match = false;
- int i;
-
- /*
- * Is the constant "=" to any of the column's most common
- * values? (Although the given operator may not really be
- * "=", we will assume that seeing whether it returns TRUE is
- * an appropriate test. If you don't like this, maybe you
- * shouldn't be using eqsel for your operator...)
- */
- if (get_attstatsslot(statsTuple, var->vartype, var->vartypmod,
- STATISTIC_KIND_MCV, InvalidOid,
- &values, &nvalues,
- &numbers, &nnumbers))
- {
- FmgrInfo eqproc;
-
- fmgr_info(get_opcode(operator), &eqproc);
-
- for (i = 0; i < nvalues; i++)
- {
- /* be careful to apply operator right way 'round */
- if (varonleft)
- match = DatumGetBool(FunctionCall2(&eqproc,
- values[i],
- constval));
- else
- match = DatumGetBool(FunctionCall2(&eqproc,
- constval,
- values[i]));
- if (match)
- break;
- }
- }
- else
- {
- /* no most-common-value info available */
- values = NULL;
- numbers = NULL;
- i = nvalues = nnumbers = 0;
- }
-
- if (match)
- {
- /*
- * Constant is "=" to this common value. We know
- * selectivity exactly (or as exactly as VACUUM could
- * calculate it, anyway).
- */
- selec = numbers[i];
- }
- else
- {
- /*
- * Comparison is against a constant that is neither NULL
- * nor any of the common values. Its selectivity cannot
- * be more than this:
- */
- double sumcommon = 0.0;
- double otherdistinct;
-
- for (i = 0; i < nnumbers; i++)
- sumcommon += numbers[i];
- selec = 1.0 - sumcommon - stats->stanullfrac;
- CLAMP_PROBABILITY(selec);
-
- /*
- * and in fact it's probably a good deal less. We
- * approximate that all the not-common values share this
- * remaining fraction equally, so we divide by the number
- * of other distinct values.
- */
- otherdistinct = get_att_numdistinct(root, var, stats)
- - nnumbers;
- if (otherdistinct > 1)
- selec /= otherdistinct;
-
- /*
- * Another cross-check: selectivity shouldn't be estimated
- * as more than the least common "most common value".
- */
- if (nnumbers > 0 && selec > numbers[nnumbers - 1])
- selec = numbers[nnumbers - 1];
- }
-
- free_attstatsslot(var->vartype, values, nvalues,
- numbers, nnumbers);
- }
- else
- {
- double ndistinct;
-
- /*
- * Search is for a value that we do not know a priori, but we
- * will assume it is not NULL. Estimate the selectivity as
- * non-null fraction divided by number of distinct values, so
- * that we get a result averaged over all possible values
- * whether common or uncommon. (Essentially, we are assuming
- * that the not-yet-known comparison value is equally likely
- * to be any of the possible values, regardless of their
- * frequency in the table. Is that a good idea?)
- */
- selec = 1.0 - stats->stanullfrac;
- ndistinct = get_att_numdistinct(root, var, stats);
- if (ndistinct > 1)
- selec /= ndistinct;
-
- /*
- * Cross-check: selectivity should never be estimated as more
- * than the most common value's.
- */
- if (get_attstatsslot(statsTuple, var->vartype, var->vartypmod,
- STATISTIC_KIND_MCV, InvalidOid,
- NULL, NULL,
- &numbers, &nnumbers))
- {
- if (nnumbers > 0 && selec > numbers[0])
- selec = numbers[0];
- free_attstatsslot(var->vartype, NULL, 0, numbers, nnumbers);
- }
- }
-
- ReleaseSysCache(statsTuple);
- }
- else
- {
- /*
- * No VACUUM ANALYZE stats available, so make a guess using
- * estimated number of distinct values and assuming they are
- * equally common. (The guess is unlikely to be very good, but we
- * do know a few special cases.)
- */
- selec = 1.0 / get_att_numdistinct(root, var, NULL);
- }
-
- /* result should be in range, but make sure... */
- CLAMP_PROBABILITY(selec);
-
- PG_RETURN_FLOAT8((float8) selec);
-}
-
-/*
- * neqsel - Selectivity of "!=" for any data types.
- *
- * This routine is also used for some operators that are not "!="
- * but have comparable selectivity behavior. See above comments
- * for eqsel().
- */
-Datum
-neqsel(PG_FUNCTION_ARGS)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
- Oid operator = PG_GETARG_OID(1);
- List *args = (List *) PG_GETARG_POINTER(2);
- int varRelid = PG_GETARG_INT32(3);
- Oid eqop;
- float8 result;
-
- /*
- * We want 1 - eqsel() where the equality operator is the one
- * associated with this != operator, that is, its negator.
- */
- eqop = get_negator(operator);
- if (eqop)
- {
- result = DatumGetFloat8(DirectFunctionCall4(eqsel,
- PointerGetDatum(root),
- ObjectIdGetDatum(eqop),
- PointerGetDatum(args),
- Int32GetDatum(varRelid)));
- }
- else
- {
- /* Use default selectivity (should we raise an error instead?) */
- result = DEFAULT_EQ_SEL;
- }
- result = 1.0 - result;
- PG_RETURN_FLOAT8(result);
-}
-
-/*
- * scalarineqsel - Selectivity of "<", "<=", ">", ">=" for scalars.
- *
- * This is the guts of both scalarltsel and scalargtsel. The caller has
- * commuted the clause, if necessary, so that we can treat the Var as
- * being on the left. The caller must also make sure that the other side
- * of the clause is a non-null Const, and dissect same into a value and
- * datatype.
- *
- * This routine works for any datatype (or pair of datatypes) known to
- * convert_to_scalar(). If it is applied to some other datatype,
- * it will return a default estimate.
- */
-static double
-scalarineqsel(Query *root, Oid operator, bool isgt,
- Var *var, Datum constval, Oid consttype)
-{
- Oid relid;
- HeapTuple statsTuple;
- Form_pg_statistic stats;
- FmgrInfo opproc;
- Datum *values;
- int nvalues;
- float4 *numbers;
- int nnumbers;
- double mcv_selec,
- hist_selec,
- sumcommon;
- double selec;
- int i;
-
- /*
- * If expression is not var op something or something op var for a
- * simple var of a real relation (no subqueries, for now), then punt
- * and return a default estimate.
- */
- relid = getrelid(var->varno, root->rtable);
- if (relid == InvalidOid)
- return DEFAULT_INEQ_SEL;
-
- /* get stats for the attribute */
- statsTuple = SearchSysCache(STATRELATT,
- ObjectIdGetDatum(relid),
- Int16GetDatum(var->varattno),
- 0, 0);
- if (!HeapTupleIsValid(statsTuple))
- {
- /* no stats available, so default result */
- return DEFAULT_INEQ_SEL;
- }
- stats = (Form_pg_statistic) GETSTRUCT(statsTuple);
-
- fmgr_info(get_opcode(operator), &opproc);
-
- /*
- * If we have most-common-values info, add up the fractions of the MCV
- * entries that satisfy MCV OP CONST. These fractions contribute
- * directly to the result selectivity. Also add up the total fraction
- * represented by MCV entries.
- */
- mcv_selec = 0.0;
- sumcommon = 0.0;
-
- if (get_attstatsslot(statsTuple, var->vartype, var->vartypmod,
- STATISTIC_KIND_MCV, InvalidOid,
- &values, &nvalues,
- &numbers, &nnumbers))
- {
- for (i = 0; i < nvalues; i++)
- {
- if (DatumGetBool(FunctionCall2(&opproc,
- values[i],
- constval)))
- mcv_selec += numbers[i];
- sumcommon += numbers[i];
- }
- free_attstatsslot(var->vartype, values, nvalues, numbers, nnumbers);
- }
-
- /*
- * If there is a histogram, determine which bin the constant falls in,
- * and compute the resulting contribution to selectivity.
- *
- * Someday, VACUUM might store more than one histogram per rel/att,
- * corresponding to more than one possible sort ordering defined for
- * the column type. However, to make that work we will need to figure
- * out which staop to search for --- it's not necessarily the one we
- * have at hand! (For example, we might have a '<=' operator rather
- * than the '<' operator that will appear in staop.) For now, assume
- * that whatever appears in pg_statistic is sorted the same way our
- * operator sorts, or the reverse way if isgt is TRUE.
- */
- hist_selec = 0.0;
-
- if (get_attstatsslot(statsTuple, var->vartype, var->vartypmod,
- STATISTIC_KIND_HISTOGRAM, InvalidOid,
- &values, &nvalues,
- NULL, NULL))
- {
- if (nvalues > 1)
- {
- double histfrac;
- bool ltcmp;
-
- ltcmp = DatumGetBool(FunctionCall2(&opproc,
- values[0],
- constval));
- if (isgt)
- ltcmp = !ltcmp;
- if (!ltcmp)
- {
- /* Constant is below lower histogram boundary. */
- histfrac = 0.0;
- }
- else
- {
- /*
- * Scan to find proper location. This could be made
- * faster by using a binary-search method, but it's
- * probably not worth the trouble for typical histogram
- * sizes.
- */
- for (i = 1; i < nvalues; i++)
- {
- ltcmp = DatumGetBool(FunctionCall2(&opproc,
- values[i],
- constval));
- if (isgt)
- ltcmp = !ltcmp;
- if (!ltcmp)
- break;
- }
- if (i >= nvalues)
- {
- /* Constant is above upper histogram boundary. */
- histfrac = 1.0;
- }
- else
- {
- double val,
- high,
- low;
- double binfrac;
-
- /*
- * We have values[i-1] < constant < values[i].
- *
- * Convert the constant and the two nearest bin boundary
- * values to a uniform comparison scale, and do a
- * linear interpolation within this bin.
- */
- if (convert_to_scalar(constval, consttype, &val,
- values[i - 1], values[i],
- var->vartype,
- &low, &high))
- {
- if (high <= low)
- {
- /* cope if bin boundaries appear identical */
- binfrac = 0.5;
- }
- else if (val <= low)
- binfrac = 0.0;
- else if (val >= high)
- binfrac = 1.0;
- else
- {
- binfrac = (val - low) / (high - low);
-
- /*
- * Watch out for the possibility that we got a
- * NaN or Infinity from the division. This
- * can happen despite the previous checks, if
- * for example "low" is -Infinity.
- */
- if (isnan(binfrac) ||
- binfrac < 0.0 || binfrac > 1.0)
- binfrac = 0.5;
- }
- }
- else
- {
- /*
- * Ideally we'd produce an error here, on the
- * grounds that the given operator shouldn't have
- * scalarXXsel registered as its selectivity func
- * unless we can deal with its operand types. But
- * currently, all manner of stuff is invoking
- * scalarXXsel, so give a default estimate until
- * that can be fixed.
- */
- binfrac = 0.5;
- }
-
- /*
- * Now, compute the overall selectivity across the
- * values represented by the histogram. We have i-1
- * full bins and binfrac partial bin below the
- * constant.
- */
- histfrac = (double) (i - 1) + binfrac;
- histfrac /= (double) (nvalues - 1);
- }
- }
-
- /*
- * Now histfrac = fraction of histogram entries below the
- * constant.
- *
- * Account for "<" vs ">"
- */
- hist_selec = isgt ? (1.0 - histfrac) : histfrac;
-
- /*
- * The histogram boundaries are only approximate to begin
- * with, and may well be out of date anyway. Therefore, don't
- * believe extremely small or large selectivity estimates.
- */
- if (hist_selec < 0.0001)
- hist_selec = 0.0001;
- else if (hist_selec > 0.9999)
- hist_selec = 0.9999;
- }
-
- free_attstatsslot(var->vartype, values, nvalues, NULL, 0);
- }
-
- /*
- * Now merge the results from the MCV and histogram calculations,
- * realizing that the histogram covers only the non-null values that
- * are not listed in MCV.
- */
- selec = 1.0 - stats->stanullfrac - sumcommon;
-
- if (hist_selec > 0.0)
- selec *= hist_selec;
- else
- {
- /*
- * If no histogram but there are values not accounted for by MCV,
- * arbitrarily assume half of them will match.
- */
- selec *= 0.5;
- }
-
- selec += mcv_selec;
-
- ReleaseSysCache(statsTuple);
-
- /* result should be in range, but make sure... */
- CLAMP_PROBABILITY(selec);
-
- return selec;
-}
-
-/*
- * scalarltsel - Selectivity of "<" (also "<=") for scalars.
- */
-Datum
-scalarltsel(PG_FUNCTION_ARGS)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
- Oid operator = PG_GETARG_OID(1);
- List *args = (List *) PG_GETARG_POINTER(2);
- int varRelid = PG_GETARG_INT32(3);
- Var *var;
- Node *other;
- Datum constval;
- Oid consttype;
- bool varonleft;
- bool isgt;
- double selec;
-
- /*
- * If expression is not var op something or something op var for a
- * simple var of a real relation (no subqueries, for now), then punt
- * and return a default estimate.
- */
- if (!get_restriction_var(args, varRelid,
- &var, &other, &varonleft))
- PG_RETURN_FLOAT8(DEFAULT_INEQ_SEL);
-
- /*
- * Can't do anything useful if the something is not a constant,
- * either.
- */
- if (!IsA(other, Const))
- PG_RETURN_FLOAT8(DEFAULT_INEQ_SEL);
-
- /*
- * If the constant is NULL, assume operator is strict and return zero,
- * ie, operator will never return TRUE.
- */
- if (((Const *) other)->constisnull)
- PG_RETURN_FLOAT8(0.0);
- constval = ((Const *) other)->constvalue;
- consttype = ((Const *) other)->consttype;
-
- /*
- * Force the var to be on the left to simplify logic in scalarineqsel.
- */
- if (varonleft)
- {
- /* we have var < other */
- isgt = false;
- }
- else
- {
- /* we have other < var, commute to make var > other */
- operator = get_commutator(operator);
- if (!operator)
- {
- /* Use default selectivity (should we raise an error instead?) */
- PG_RETURN_FLOAT8(DEFAULT_INEQ_SEL);
- }
- isgt = true;
- }
-
- selec = scalarineqsel(root, operator, isgt, var, constval, consttype);
-
- PG_RETURN_FLOAT8((float8) selec);
-}
-
-/*
- * scalargtsel - Selectivity of ">" (also ">=") for integers.
- */
-Datum
-scalargtsel(PG_FUNCTION_ARGS)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
- Oid operator = PG_GETARG_OID(1);
- List *args = (List *) PG_GETARG_POINTER(2);
- int varRelid = PG_GETARG_INT32(3);
- Var *var;
- Node *other;
- Datum constval;
- Oid consttype;
- bool varonleft;
- bool isgt;
- double selec;
-
- /*
- * If expression is not var op something or something op var for a
- * simple var of a real relation (no subqueries, for now), then punt
- * and return a default estimate.
- */
- if (!get_restriction_var(args, varRelid,
- &var, &other, &varonleft))
- PG_RETURN_FLOAT8(DEFAULT_INEQ_SEL);
-
- /*
- * Can't do anything useful if the something is not a constant,
- * either.
- */
- if (!IsA(other, Const))
- PG_RETURN_FLOAT8(DEFAULT_INEQ_SEL);
-
- /*
- * If the constant is NULL, assume operator is strict and return zero,
- * ie, operator will never return TRUE.
- */
- if (((Const *) other)->constisnull)
- PG_RETURN_FLOAT8(0.0);
- constval = ((Const *) other)->constvalue;
- consttype = ((Const *) other)->consttype;
-
- /*
- * Force the var to be on the left to simplify logic in scalarineqsel.
- */
- if (varonleft)
- {
- /* we have var > other */
- isgt = true;
- }
- else
- {
- /* we have other > var, commute to make var < other */
- operator = get_commutator(operator);
- if (!operator)
- {
- /* Use default selectivity (should we raise an error instead?) */
- PG_RETURN_FLOAT8(DEFAULT_INEQ_SEL);
- }
- isgt = false;
- }
-
- selec = scalarineqsel(root, operator, isgt, var, constval, consttype);
-
- PG_RETURN_FLOAT8((float8) selec);
-}
-
-/*
- * patternsel - Generic code for pattern-match selectivity.
- */
-static double
-patternsel(PG_FUNCTION_ARGS, Pattern_Type ptype)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
-
-#ifdef NOT_USED
- Oid operator = PG_GETARG_OID(1);
-#endif
- List *args = (List *) PG_GETARG_POINTER(2);
- int varRelid = PG_GETARG_INT32(3);
- Var *var;
- Node *other;
- bool varonleft;
- Oid relid;
- Datum constval;
- char *patt;
- Pattern_Prefix_Status pstatus;
- char *prefix;
- char *rest;
- double result;
-
- /*
- * If expression is not var op constant for a simple var of a real
- * relation (no subqueries, for now), then punt and return a default
- * estimate.
- */
- if (!get_restriction_var(args, varRelid,
- &var, &other, &varonleft))
- return DEFAULT_MATCH_SEL;
- if (!varonleft || !IsA(other, Const))
- return DEFAULT_MATCH_SEL;
- relid = getrelid(var->varno, root->rtable);
- if (relid == InvalidOid)
- return DEFAULT_MATCH_SEL;
-
- /*
- * If the constant is NULL, assume operator is strict and return zero,
- * ie, operator will never return TRUE.
- */
- if (((Const *) other)->constisnull)
- return 0.0;
- constval = ((Const *) other)->constvalue;
- /* the right-hand const is type text for all supported operators */
- Assert(((Const *) other)->consttype == TEXTOID);
- patt = DatumGetCString(DirectFunctionCall1(textout, constval));
-
- /* divide pattern into fixed prefix and remainder */
- pstatus = pattern_fixed_prefix(patt, ptype, &prefix, &rest);
-
- if (pstatus == Pattern_Prefix_Exact)
- {
- /*
- * Pattern specifies an exact match, so pretend operator is '='
- */
- Oid eqopr = find_operator("=", var->vartype);
- Const *eqcon;
- List *eqargs;
-
- if (eqopr == InvalidOid)
- elog(ERROR, "patternsel: no = operator for type %u",
- var->vartype);
- eqcon = string_to_const(prefix, var->vartype);
- eqargs = makeList2(var, eqcon);
- result = DatumGetFloat8(DirectFunctionCall4(eqsel,
- PointerGetDatum(root),
- ObjectIdGetDatum(eqopr),
- PointerGetDatum(eqargs),
- Int32GetDatum(varRelid)));
- }
- else
- {
- /*
- * Not exact-match pattern. We estimate selectivity of the fixed
- * prefix and remainder of pattern separately, then combine the
- * two.
- */
- Selectivity prefixsel;
- Selectivity restsel;
- Selectivity selec;
-
- if (pstatus == Pattern_Prefix_Partial)
- prefixsel = prefix_selectivity(root, var, prefix);
- else
- prefixsel = 1.0;
- restsel = pattern_selectivity(rest, ptype);
- selec = prefixsel * restsel;
- /* result should be in range, but make sure... */
- CLAMP_PROBABILITY(selec);
- result = selec;
- }
-
- if (prefix)
- pfree(prefix);
- pfree(patt);
-
- return result;
-}
-
-/*
- * regexeqsel - Selectivity of regular-expression pattern match.
- */
-Datum
-regexeqsel(PG_FUNCTION_ARGS)
-{
- PG_RETURN_FLOAT8(patternsel(fcinfo, Pattern_Type_Regex));
-}
-
-/*
- * icregexeqsel - Selectivity of case-insensitive regex match.
- */
-Datum
-icregexeqsel(PG_FUNCTION_ARGS)
-{
- PG_RETURN_FLOAT8(patternsel(fcinfo, Pattern_Type_Regex_IC));
-}
-
-/*
- * likesel - Selectivity of LIKE pattern match.
- */
-Datum
-likesel(PG_FUNCTION_ARGS)
-{
- PG_RETURN_FLOAT8(patternsel(fcinfo, Pattern_Type_Like));
-}
-
-/*
- * iclikesel - Selectivity of ILIKE pattern match.
- */
-Datum
-iclikesel(PG_FUNCTION_ARGS)
-{
- PG_RETURN_FLOAT8(patternsel(fcinfo, Pattern_Type_Like_IC));
-}
-
-/*
- * regexnesel - Selectivity of regular-expression pattern non-match.
- */
-Datum
-regexnesel(PG_FUNCTION_ARGS)
-{
- double result;
-
- result = patternsel(fcinfo, Pattern_Type_Regex);
- result = 1.0 - result;
- PG_RETURN_FLOAT8(result);
-}
-
-/*
- * icregexnesel - Selectivity of case-insensitive regex non-match.
- */
-Datum
-icregexnesel(PG_FUNCTION_ARGS)
-{
- double result;
-
- result = patternsel(fcinfo, Pattern_Type_Regex_IC);
- result = 1.0 - result;
- PG_RETURN_FLOAT8(result);
-}
-
-/*
- * nlikesel - Selectivity of LIKE pattern non-match.
- */
-Datum
-nlikesel(PG_FUNCTION_ARGS)
-{
- double result;
-
- result = patternsel(fcinfo, Pattern_Type_Like);
- result = 1.0 - result;
- PG_RETURN_FLOAT8(result);
-}
-
-/*
- * icnlikesel - Selectivity of ILIKE pattern non-match.
- */
-Datum
-icnlikesel(PG_FUNCTION_ARGS)
-{
- double result;
-
- result = patternsel(fcinfo, Pattern_Type_Like_IC);
- result = 1.0 - result;
- PG_RETURN_FLOAT8(result);
-}
-
-/*
- * booltestsel - Selectivity of BooleanTest Node.
- */
-Selectivity
-booltestsel(Query *root, BooleanTest *clause, int varRelid)
-{
- Var *var;
- Node *arg;
- Oid relid;
- HeapTuple statsTuple;
- Datum *values;
- int nvalues;
- float4 *numbers;
- int nnumbers;
- double selec;
-
- Assert(clause && IsA(clause, BooleanTest));
-
- arg = (Node *) clause->arg;
-
- /*
- * Ignore any binary-compatible relabeling (probably unnecessary, but
- * can't hurt)
- */
- if (IsA(arg, RelabelType))
- arg = ((RelabelType *) arg)->arg;
-
- if (IsA(arg, Var) &&(varRelid == 0 || varRelid == ((Var *) arg)->varno))
- var = (Var *) arg;
- else
- {
- /*
- * If argument is not a Var, we can't get statistics for it, but
- * perhaps clause_selectivity can do something with it. We ignore
- * the possibility of a NULL value when using clause_selectivity,
- * and just assume the value is either TRUE or FALSE.
- */
- switch (clause->booltesttype)
- {
- case IS_UNKNOWN:
- selec = DEFAULT_UNK_SEL;
- break;
- case IS_NOT_UNKNOWN:
- selec = DEFAULT_NOT_UNK_SEL;
- break;
- case IS_TRUE:
- case IS_NOT_FALSE:
- selec = (double) clause_selectivity(root, arg, varRelid);
- break;
- case IS_FALSE:
- case IS_NOT_TRUE:
- selec = 1.0 - (double) clause_selectivity(root, arg, varRelid);
- break;
- default:
- elog(ERROR, "booltestsel: unexpected booltesttype %d",
- (int) clause->booltesttype);
- selec = 0.0; /* Keep compiler quiet */
- break;
- }
- return (Selectivity) selec;
- }
-
- /* get stats for the attribute, if available */
- relid = getrelid(var->varno, root->rtable);
- if (relid == InvalidOid)
- statsTuple = NULL;
- else
- statsTuple = SearchSysCache(STATRELATT,
- ObjectIdGetDatum(relid),
- Int16GetDatum(var->varattno),
- 0, 0);
-
- if (HeapTupleIsValid(statsTuple))
- {
- Form_pg_statistic stats;
- double freq_null;
-
- stats = (Form_pg_statistic) GETSTRUCT(statsTuple);
-
- freq_null = stats->stanullfrac;
-
- if (get_attstatsslot(statsTuple, var->vartype, var->vartypmod,
- STATISTIC_KIND_MCV, InvalidOid,
- &values, &nvalues,
- &numbers, &nnumbers)
- && nnumbers > 0)
- {
- double freq_true;
- double freq_false;
-
- /*
- * Get first MCV frequency and derive frequency for true.
- */
- if (DatumGetBool(values[0]))
- freq_true = numbers[0];
- else
- freq_true = 1.0 - numbers[0] - freq_null;
-
- /*
- * Next derive freqency for false. Then use these as
- * appropriate to derive frequency for each case.
- */
- freq_false = 1.0 - freq_true - freq_null;
-
- switch (clause->booltesttype)
- {
- case IS_UNKNOWN:
- /* select only NULL values */
- selec = freq_null;
- break;
- case IS_NOT_UNKNOWN:
- /* select non-NULL values */
- selec = 1.0 - freq_null;
- break;
- case IS_TRUE:
- /* select only TRUE values */
- selec = freq_true;
- break;
- case IS_NOT_TRUE:
- /* select non-TRUE values */
- selec = 1.0 - freq_true;
- break;
- case IS_FALSE:
- /* select only FALSE values */
- selec = freq_false;
- break;
- case IS_NOT_FALSE:
- /* select non-FALSE values */
- selec = 1.0 - freq_false;
- break;
- default:
- elog(ERROR, "booltestsel: unexpected booltesttype %d",
- (int) clause->booltesttype);
- selec = 0.0; /* Keep compiler quiet */
- break;
- }
-
- free_attstatsslot(var->vartype, values, nvalues,
- numbers, nnumbers);
- }
- else
- {
- /*
- * No most-common-value info available. Still have null
- * fraction information, so use it for IS [NOT] UNKNOWN.
- * Otherwise adjust for null fraction and assume an even split
- * for boolean tests.
- */
- switch (clause->booltesttype)
- {
- case IS_UNKNOWN:
-
- /*
- * Use freq_null directly.
- */
- selec = freq_null;
- break;
- case IS_NOT_UNKNOWN:
-
- /*
- * Select not unknown (not null) values. Calculate
- * from freq_null.
- */
- selec = 1.0 - freq_null;
- break;
- case IS_TRUE:
- case IS_NOT_TRUE:
- case IS_FALSE:
- case IS_NOT_FALSE:
- selec = (1.0 - freq_null) / 2.0;
- break;
- default:
- elog(ERROR, "booltestsel: unexpected booltesttype %d",
- (int) clause->booltesttype);
- selec = 0.0; /* Keep compiler quiet */
- break;
- }
- }
-
- ReleaseSysCache(statsTuple);
- }
- else
- {
- /*
- * No VACUUM ANALYZE stats available, so use a default value.
- * (Note: not much point in recursing to clause_selectivity here.)
- */
- switch (clause->booltesttype)
- {
- case IS_UNKNOWN:
- selec = DEFAULT_UNK_SEL;
- break;
- case IS_NOT_UNKNOWN:
- selec = DEFAULT_NOT_UNK_SEL;
- break;
- case IS_TRUE:
- case IS_NOT_TRUE:
- case IS_FALSE:
- case IS_NOT_FALSE:
- selec = DEFAULT_BOOL_SEL;
- break;
- default:
- elog(ERROR, "booltestsel: unexpected booltesttype %d",
- (int) clause->booltesttype);
- selec = 0.0; /* Keep compiler quiet */
- break;
- }
- }
-
- /* result should be in range, but make sure... */
- CLAMP_PROBABILITY(selec);
-
- return (Selectivity) selec;
-}
-
-/*
- * nulltestsel - Selectivity of NullTest Node.
- */
-Selectivity
-nulltestsel(Query *root, NullTest *clause, int varRelid)
-{
- Var *var;
- Node *arg;
- Oid relid;
- HeapTuple statsTuple;
- double selec;
- double defselec;
- double freq_null;
-
- Assert(clause && IsA(clause, NullTest));
-
- switch (clause->nulltesttype)
- {
- case IS_NULL:
- defselec = DEFAULT_UNK_SEL;
- break;
- case IS_NOT_NULL:
- defselec = DEFAULT_NOT_UNK_SEL;
- break;
- default:
- elog(ERROR, "nulltestsel: unexpected nulltesttype %d",
- (int) clause->nulltesttype);
- return (Selectivity) 0; /* keep compiler quiet */
- }
-
- arg = (Node *) clause->arg;
-
- /*
- * Ignore any binary-compatible relabeling
- */
- if (IsA(arg, RelabelType))
- arg = ((RelabelType *) arg)->arg;
-
- if (IsA(arg, Var) &&(varRelid == 0 || varRelid == ((Var *) arg)->varno))
- var = (Var *) arg;
- else
- {
- /*
- * punt if non-Var argument
- */
- return (Selectivity) defselec;
- }
-
- relid = getrelid(var->varno, root->rtable);
- if (relid == InvalidOid)
- return (Selectivity) defselec;
-
- /* get stats for the attribute, if available */
- statsTuple = SearchSysCache(STATRELATT,
- ObjectIdGetDatum(relid),
- Int16GetDatum(var->varattno),
- 0, 0);
- if (HeapTupleIsValid(statsTuple))
- {
- Form_pg_statistic stats;
-
- stats = (Form_pg_statistic) GETSTRUCT(statsTuple);
- freq_null = stats->stanullfrac;
-
- switch (clause->nulltesttype)
- {
- case IS_NULL:
-
- /*
- * Use freq_null directly.
- */
- selec = freq_null;
- break;
- case IS_NOT_NULL:
-
- /*
- * Select not unknown (not null) values. Calculate from
- * freq_null.
- */
- selec = 1.0 - freq_null;
- break;
- default:
- elog(ERROR, "nulltestsel: unexpected nulltesttype %d",
- (int) clause->nulltesttype);
- return (Selectivity) 0; /* keep compiler quiet */
- }
-
- ReleaseSysCache(statsTuple);
- }
- else
- {
- /*
- * No VACUUM ANALYZE stats available, so make a guess
- */
- selec = defselec;
- }
-
- /* result should be in range, but make sure... */
- CLAMP_PROBABILITY(selec);
-
- return (Selectivity) selec;
-}
-
-/*
- * eqjoinsel - Join selectivity of "="
- */
-Datum
-eqjoinsel(PG_FUNCTION_ARGS)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
- Oid operator = PG_GETARG_OID(1);
- List *args = (List *) PG_GETARG_POINTER(2);
- Var *var1;
- Var *var2;
- double selec;
-
- get_join_vars(args, &var1, &var2);
-
- if (var1 == NULL && var2 == NULL)
- selec = DEFAULT_EQ_SEL;
- else
- {
- HeapTuple statsTuple1 = NULL;
- HeapTuple statsTuple2 = NULL;
- Form_pg_statistic stats1 = NULL;
- Form_pg_statistic stats2 = NULL;
- double nd1 = DEFAULT_NUM_DISTINCT;
- double nd2 = DEFAULT_NUM_DISTINCT;
- bool have_mcvs1 = false;
- Datum *values1 = NULL;
- int nvalues1 = 0;
- float4 *numbers1 = NULL;
- int nnumbers1 = 0;
- bool have_mcvs2 = false;
- Datum *values2 = NULL;
- int nvalues2 = 0;
- float4 *numbers2 = NULL;
- int nnumbers2 = 0;
-
- if (var1 != NULL)
- {
- /* get stats for the attribute, if available */
- Oid relid1 = getrelid(var1->varno, root->rtable);
-
- if (relid1 != InvalidOid)
- {
- statsTuple1 = SearchSysCache(STATRELATT,
- ObjectIdGetDatum(relid1),
- Int16GetDatum(var1->varattno),
- 0, 0);
- if (HeapTupleIsValid(statsTuple1))
- {
- stats1 = (Form_pg_statistic) GETSTRUCT(statsTuple1);
- have_mcvs1 = get_attstatsslot(statsTuple1,
- var1->vartype,
- var1->vartypmod,
- STATISTIC_KIND_MCV,
- InvalidOid,
- &values1, &nvalues1,
- &numbers1, &nnumbers1);
- }
-
- nd1 = get_att_numdistinct(root, var1, stats1);
- }
- }
-
- if (var2 != NULL)
- {
- /* get stats for the attribute, if available */
- Oid relid2 = getrelid(var2->varno, root->rtable);
-
- if (relid2 != InvalidOid)
- {
- statsTuple2 = SearchSysCache(STATRELATT,
- ObjectIdGetDatum(relid2),
- Int16GetDatum(var2->varattno),
- 0, 0);
- if (HeapTupleIsValid(statsTuple2))
- {
- stats2 = (Form_pg_statistic) GETSTRUCT(statsTuple2);
- have_mcvs2 = get_attstatsslot(statsTuple2,
- var2->vartype,
- var2->vartypmod,
- STATISTIC_KIND_MCV,
- InvalidOid,
- &values2, &nvalues2,
- &numbers2, &nnumbers2);
- }
-
- nd2 = get_att_numdistinct(root, var2, stats2);
- }
- }
-
- if (have_mcvs1 && have_mcvs2)
- {
- /*
- * We have most-common-value lists for both relations. Run
- * through the lists to see which MCVs actually join to each
- * other with the given operator. This allows us to determine
- * the exact join selectivity for the portion of the relations
- * represented by the MCV lists. We still have to estimate
- * for the remaining population, but in a skewed distribution
- * this gives us a big leg up in accuracy. For motivation see
- * the analysis in Y. Ioannidis and S. Christodoulakis, "On
- * the propagation of errors in the size of join results",
- * Technical Report 1018, Computer Science Dept., University
- * of Wisconsin, Madison, March 1991 (available from
- * ftp.cs.wisc.edu).
- */
- FmgrInfo eqproc;
- bool *hasmatch1;
- bool *hasmatch2;
- double matchprodfreq,
- matchfreq1,
- matchfreq2,
- unmatchfreq1,
- unmatchfreq2,
- otherfreq1,
- otherfreq2,
- totalsel1,
- totalsel2;
- int i,
- nmatches;
-
- fmgr_info(get_opcode(operator), &eqproc);
- hasmatch1 = (bool *) palloc(nvalues1 * sizeof(bool));
- memset(hasmatch1, 0, nvalues1 * sizeof(bool));
- hasmatch2 = (bool *) palloc(nvalues2 * sizeof(bool));
- memset(hasmatch2, 0, nvalues2 * sizeof(bool));
-
- /*
- * Note we assume that each MCV will match at most one member
- * of the other MCV list. If the operator isn't really
- * equality, there could be multiple matches --- but we don't
- * look for them, both for speed and because the math wouldn't
- * add up...
- */
- matchprodfreq = 0.0;
- nmatches = 0;
- for (i = 0; i < nvalues1; i++)
- {
- int j;
-
- for (j = 0; j < nvalues2; j++)
- {
- if (hasmatch2[j])
- continue;
- if (DatumGetBool(FunctionCall2(&eqproc,
- values1[i],
- values2[j])))
- {
- hasmatch1[i] = hasmatch2[j] = true;
- matchprodfreq += numbers1[i] * numbers2[j];
- nmatches++;
- break;
- }
- }
- }
- CLAMP_PROBABILITY(matchprodfreq);
- /* Sum up frequencies of matched and unmatched MCVs */
- matchfreq1 = unmatchfreq1 = 0.0;
- for (i = 0; i < nvalues1; i++)
- {
- if (hasmatch1[i])
- matchfreq1 += numbers1[i];
- else
- unmatchfreq1 += numbers1[i];
- }
- CLAMP_PROBABILITY(matchfreq1);
- CLAMP_PROBABILITY(unmatchfreq1);
- matchfreq2 = unmatchfreq2 = 0.0;
- for (i = 0; i < nvalues2; i++)
- {
- if (hasmatch2[i])
- matchfreq2 += numbers2[i];
- else
- unmatchfreq2 += numbers2[i];
- }
- CLAMP_PROBABILITY(matchfreq2);
- CLAMP_PROBABILITY(unmatchfreq2);
- pfree(hasmatch1);
- pfree(hasmatch2);
-
- /*
- * Compute total frequency of non-null values that are not in
- * the MCV lists.
- */
- otherfreq1 = 1.0 - stats1->stanullfrac - matchfreq1 - unmatchfreq1;
- otherfreq2 = 1.0 - stats2->stanullfrac - matchfreq2 - unmatchfreq2;
- CLAMP_PROBABILITY(otherfreq1);
- CLAMP_PROBABILITY(otherfreq2);
-
- /*
- * We can estimate the total selectivity from the point of
- * view of relation 1 as: the known selectivity for matched
- * MCVs, plus unmatched MCVs that are assumed to match against
- * random members of relation 2's non-MCV population, plus
- * non-MCV values that are assumed to match against random
- * members of relation 2's unmatched MCVs plus non-MCV values.
- */
- totalsel1 = matchprodfreq;
- if (nd2 > nvalues2)
- totalsel1 += unmatchfreq1 * otherfreq2 / (nd2 - nvalues2);
- if (nd2 > nmatches)
- totalsel1 += otherfreq1 * (otherfreq2 + unmatchfreq2) /
- (nd2 - nmatches);
- /* Same estimate from the point of view of relation 2. */
- totalsel2 = matchprodfreq;
- if (nd1 > nvalues1)
- totalsel2 += unmatchfreq2 * otherfreq1 / (nd1 - nvalues1);
- if (nd1 > nmatches)
- totalsel2 += otherfreq2 * (otherfreq1 + unmatchfreq1) /
- (nd1 - nmatches);
-
- /*
- * Use the smaller of the two estimates. This can be
- * justified in essentially the same terms as given below for
- * the no-stats case: to a first approximation, we are
- * estimating from the point of view of the relation with
- * smaller nd.
- */
- selec = (totalsel1 < totalsel2) ? totalsel1 : totalsel2;
- }
- else
- {
- /*
- * We do not have MCV lists for both sides. Estimate the join
- * selectivity as MIN(1/nd1, 1/nd2). This is plausible if we
- * assume that the values are about equally distributed: a
- * given tuple of rel1 will join to either 0 or N2/nd2 rows of
- * rel2, so total join rows are at most N1*N2/nd2 giving a
- * join selectivity of not more than 1/nd2. By the same logic
- * it is not more than 1/nd1, so MIN(1/nd1, 1/nd2) is an upper
- * bound. Using the MIN() means we estimate from the point of
- * view of the relation with smaller nd (since the larger nd
- * is determining the MIN). It is reasonable to assume that
- * most tuples in this rel will have join partners, so the
- * bound is probably reasonably tight and should be taken
- * as-is.
- *
- * XXX Can we be smarter if we have an MCV list for just one
- * side? It seems that if we assume equal distribution for the
- * other side, we end up with the same answer anyway.
- */
- if (nd1 > nd2)
- selec = 1.0 / nd1;
- else
- selec = 1.0 / nd2;
- }
-
- if (have_mcvs1)
- free_attstatsslot(var1->vartype, values1, nvalues1,
- numbers1, nnumbers1);
- if (have_mcvs2)
- free_attstatsslot(var2->vartype, values2, nvalues2,
- numbers2, nnumbers2);
- if (HeapTupleIsValid(statsTuple1))
- ReleaseSysCache(statsTuple1);
- if (HeapTupleIsValid(statsTuple2))
- ReleaseSysCache(statsTuple2);
- }
-
- CLAMP_PROBABILITY(selec);
-
- PG_RETURN_FLOAT8((float8) selec);
-}
-
-/*
- * neqjoinsel - Join selectivity of "!="
- */
-Datum
-neqjoinsel(PG_FUNCTION_ARGS)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
- Oid operator = PG_GETARG_OID(1);
- List *args = (List *) PG_GETARG_POINTER(2);
- Oid eqop;
- float8 result;
-
- /*
- * We want 1 - eqjoinsel() where the equality operator is the one
- * associated with this != operator, that is, its negator.
- */
- eqop = get_negator(operator);
- if (eqop)
- {
- result = DatumGetFloat8(DirectFunctionCall3(eqjoinsel,
- PointerGetDatum(root),
- ObjectIdGetDatum(eqop),
- PointerGetDatum(args)));
-
- }
- else
- {
- /* Use default selectivity (should we raise an error instead?) */
- result = DEFAULT_EQ_SEL;
- }
- result = 1.0 - result;
- PG_RETURN_FLOAT8(result);
-}
-
-/*
- * scalarltjoinsel - Join selectivity of "<" and "<=" for scalars
- */
-Datum
-scalarltjoinsel(PG_FUNCTION_ARGS)
-{
- PG_RETURN_FLOAT8(DEFAULT_INEQ_SEL);
-}
-
-/*
- * scalargtjoinsel - Join selectivity of ">" and ">=" for scalars
- */
-Datum
-scalargtjoinsel(PG_FUNCTION_ARGS)
-{
- PG_RETURN_FLOAT8(DEFAULT_INEQ_SEL);
-}
-
-/*
- * regexeqjoinsel - Join selectivity of regular-expression pattern match.
- */
-Datum
-regexeqjoinsel(PG_FUNCTION_ARGS)
-{
- PG_RETURN_FLOAT8(DEFAULT_MATCH_SEL);
-}
-
-/*
- * icregexeqjoinsel - Join selectivity of case-insensitive regex match.
- */
-Datum
-icregexeqjoinsel(PG_FUNCTION_ARGS)
-{
- PG_RETURN_FLOAT8(DEFAULT_MATCH_SEL);
-}
-
-/*
- * likejoinsel - Join selectivity of LIKE pattern match.
- */
-Datum
-likejoinsel(PG_FUNCTION_ARGS)
-{
- PG_RETURN_FLOAT8(DEFAULT_MATCH_SEL);
-}
-
-/*
- * iclikejoinsel - Join selectivity of ILIKE pattern match.
- */
-Datum
-iclikejoinsel(PG_FUNCTION_ARGS)
-{
- PG_RETURN_FLOAT8(DEFAULT_MATCH_SEL);
-}
-
-/*
- * regexnejoinsel - Join selectivity of regex non-match.
- */
-Datum
-regexnejoinsel(PG_FUNCTION_ARGS)
-{
- float8 result;
-
- result = DatumGetFloat8(regexeqjoinsel(fcinfo));
- result = 1.0 - result;
- PG_RETURN_FLOAT8(result);
-}
-
-/*
- * icregexnejoinsel - Join selectivity of case-insensitive regex non-match.
- */
-Datum
-icregexnejoinsel(PG_FUNCTION_ARGS)
-{
- float8 result;
-
- result = DatumGetFloat8(icregexeqjoinsel(fcinfo));
- result = 1.0 - result;
- PG_RETURN_FLOAT8(result);
-}
-
-/*
- * nlikejoinsel - Join selectivity of LIKE pattern non-match.
- */
-Datum
-nlikejoinsel(PG_FUNCTION_ARGS)
-{
- float8 result;
-
- result = DatumGetFloat8(likejoinsel(fcinfo));
- result = 1.0 - result;
- PG_RETURN_FLOAT8(result);
-}
-
-/*
- * icnlikejoinsel - Join selectivity of ILIKE pattern non-match.
- */
-Datum
-icnlikejoinsel(PG_FUNCTION_ARGS)
-{
- float8 result;
-
- result = DatumGetFloat8(iclikejoinsel(fcinfo));
- result = 1.0 - result;
- PG_RETURN_FLOAT8(result);
-}
-
-/*
- * mergejoinscansel - Scan selectivity of merge join.
- *
- * A merge join will stop as soon as it exhausts either input stream.
- * Therefore, if we can estimate the ranges of both input variables,
- * we can estimate how much of the input will actually be read. This
- * can have a considerable impact on the cost when using indexscans.
- *
- * clause should be a clause already known to be mergejoinable.
- *
- * *leftscan is set to the fraction of the left-hand variable expected
- * to be scanned (0 to 1), and similarly *rightscan for the right-hand
- * variable.
- */
-void
-mergejoinscansel(Query *root, Node *clause,
- Selectivity *leftscan,
- Selectivity *rightscan)
-{
- Var *left,
- *right;
- Oid opno,
- lsortop,
- rsortop,
- ltop,
- gtop,
- revltop;
- Datum leftmax,
- rightmax;
- double selec;
-
- /* Set default results if we can't figure anything out. */
- *leftscan = *rightscan = 1.0;
-
- /* Deconstruct the merge clause */
- if (!is_opclause(clause))
- return; /* shouldn't happen */
- opno = ((Oper *) ((Expr *) clause)->oper)->opno;
- left = get_leftop((Expr *) clause);
- right = get_rightop((Expr *) clause);
- if (!right)
- return; /* shouldn't happen */
-
- /* Can't do anything if inputs are not Vars */
- if (!IsA(left, Var) ||!IsA(right, Var))
- return;
-
- /* Verify mergejoinability and get left and right "<" operators */
- if (!op_mergejoinable(opno,
- left->vartype,
- right->vartype,
- &lsortop,
- &rsortop))
- return; /* shouldn't happen */
-
- /* Try to get maximum values of both vars */
- if (!get_var_maximum(root, left, lsortop, &leftmax))
- return; /* no max available from stats */
-
- if (!get_var_maximum(root, right, rsortop, &rightmax))
- return; /* no max available from stats */
-
- /* Look up the "left < right" and "left > right" operators */
- op_mergejoin_crossops(opno, &ltop, &gtop, NULL, NULL);
-
- /* Look up the "right < left" operator */
- revltop = get_commutator(gtop);
- if (!OidIsValid(revltop))
- return; /* shouldn't happen */
-
- /*
- * Now, the fraction of the left variable that will be scanned is the
- * fraction that's <= the right-side maximum value. But only believe
- * non-default estimates, else stick with our 1.0.
- */
- selec = scalarineqsel(root, ltop, false, left,
- rightmax, right->vartype);
- if (selec != DEFAULT_INEQ_SEL)
- *leftscan = selec;
-
- /* And similarly for the right variable. */
- selec = scalarineqsel(root, revltop, false, right,
- leftmax, left->vartype);
- if (selec != DEFAULT_INEQ_SEL)
- *rightscan = selec;
-
- /*
- * Only one of the two fractions can really be less than 1.0; believe
- * the smaller estimate and reset the other one to exactly 1.0.
- */
- if (*leftscan > *rightscan)
- *leftscan = 1.0;
- else
- *rightscan = 1.0;
-}
-
-/*
- * get_var_maximum
- * Estimate the maximum value of the specified variable.
- * If successful, store value in *max and return TRUE.
- * If no data available, return FALSE.
- *
- * sortop is the "<" comparison operator to use. (To extract the
- * minimum instead of the maximum, just pass the ">" operator instead.)
- */
-static bool
-get_var_maximum(Query *root, Var *var, Oid sortop, Datum *max)
-{
- Datum tmax = 0;
- bool have_max = false;
- Oid relid;
- HeapTuple statsTuple;
- Form_pg_statistic stats;
- int16 typLen;
- bool typByVal;
- Datum *values;
- int nvalues;
- int i;
-
- relid = getrelid(var->varno, root->rtable);
- if (relid == InvalidOid)
- return false;
-
- /* get stats for the attribute */
- statsTuple = SearchSysCache(STATRELATT,
- ObjectIdGetDatum(relid),
- Int16GetDatum(var->varattno),
- 0, 0);
- if (!HeapTupleIsValid(statsTuple))
- {
- /* no stats available, so default result */
- return false;
- }
- stats = (Form_pg_statistic) GETSTRUCT(statsTuple);
-
- get_typlenbyval(var->vartype, &typLen, &typByVal);
-
- /*
- * If there is a histogram, grab the last or first value as appropriate.
- *
- * If there is a histogram that is sorted with some other operator
- * than the one we want, fail --- this suggests that there is data
- * we can't use.
- */
- if (get_attstatsslot(statsTuple, var->vartype, var->vartypmod,
- STATISTIC_KIND_HISTOGRAM, sortop,
- &values, &nvalues,
- NULL, NULL))
- {
- if (nvalues > 0)
- {
- tmax = datumCopy(values[nvalues-1], typByVal, typLen);
- have_max = true;
- }
- free_attstatsslot(var->vartype, values, nvalues, NULL, 0);
- }
- else
- {
- Oid rsortop = get_commutator(sortop);
-
- if (OidIsValid(rsortop) &&
- get_attstatsslot(statsTuple, var->vartype, var->vartypmod,
- STATISTIC_KIND_HISTOGRAM, rsortop,
- &values, &nvalues,
- NULL, NULL))
- {
- if (nvalues > 0)
- {
- tmax = datumCopy(values[0], typByVal, typLen);
- have_max = true;
- }
- free_attstatsslot(var->vartype, values, nvalues, NULL, 0);
- }
- else if (get_attstatsslot(statsTuple, var->vartype, var->vartypmod,
- STATISTIC_KIND_HISTOGRAM, InvalidOid,
- &values, &nvalues,
- NULL, NULL))
- {
- free_attstatsslot(var->vartype, values, nvalues, NULL, 0);
- ReleaseSysCache(statsTuple);
- return false;
- }
- }
-
- /*
- * If we have most-common-values info, look for a large MCV. This
- * is needed even if we also have a histogram, since the histogram
- * excludes the MCVs. However, usually the MCVs will not be the
- * extreme values, so avoid unnecessary data copying.
- */
- if (get_attstatsslot(statsTuple, var->vartype, var->vartypmod,
- STATISTIC_KIND_MCV, InvalidOid,
- &values, &nvalues,
- NULL, NULL))
- {
- bool large_mcv = false;
- FmgrInfo opproc;
-
- fmgr_info(get_opcode(sortop), &opproc);
-
- for (i = 0; i < nvalues; i++)
- {
- if (!have_max)
- {
- tmax = values[i];
- large_mcv = have_max = true;
- }
- else if (DatumGetBool(FunctionCall2(&opproc, tmax, values[i])))
- {
- tmax = values[i];
- large_mcv = true;
- }
- }
- if (large_mcv)
- tmax = datumCopy(tmax, typByVal, typLen);
- free_attstatsslot(var->vartype, values, nvalues, NULL, 0);
- }
-
- ReleaseSysCache(statsTuple);
-
- *max = tmax;
- return have_max;
-}
-
-/*
- * convert_to_scalar
- * Convert non-NULL values of the indicated types to the comparison
- * scale needed by scalarltsel()/scalargtsel().
- * Returns "true" if successful.
- *
- * XXX this routine is a hack: ideally we should look up the conversion
- * subroutines in pg_type.
- *
- * All numeric datatypes are simply converted to their equivalent
- * "double" values. (NUMERIC values that are outside the range of "double"
- * are clamped to +/- HUGE_VAL.)
- *
- * String datatypes are converted by convert_string_to_scalar(),
- * which is explained below. The reason why this routine deals with
- * three values at a time, not just one, is that we need it for strings.
- *
- * The bytea datatype is just enough different from strings that it has
- * to be treated separately.
- *
- * The several datatypes representing absolute times are all converted
- * to Timestamp, which is actually a double, and then we just use that
- * double value. Note this will give correct results even for the "special"
- * values of Timestamp, since those are chosen to compare correctly;
- * see timestamp_cmp.
- *
- * The several datatypes representing relative times (intervals) are all
- * converted to measurements expressed in seconds.
- */
-static bool
-convert_to_scalar(Datum value, Oid valuetypid, double *scaledvalue,
- Datum lobound, Datum hibound, Oid boundstypid,
- double *scaledlobound, double *scaledhibound)
-{
- switch (valuetypid)
- {
- /*
- * Built-in numeric types
- */
- case BOOLOID:
- case INT2OID:
- case INT4OID:
- case INT8OID:
- case FLOAT4OID:
- case FLOAT8OID:
- case NUMERICOID:
- case OIDOID:
- case REGPROCOID:
- case REGPROCEDUREOID:
- case REGOPEROID:
- case REGOPERATOROID:
- case REGCLASSOID:
- case REGTYPEOID:
- *scaledvalue = convert_numeric_to_scalar(value, valuetypid);
- *scaledlobound = convert_numeric_to_scalar(lobound, boundstypid);
- *scaledhibound = convert_numeric_to_scalar(hibound, boundstypid);
- return true;
-
- /*
- * Built-in string types
- */
- case CHAROID:
- case BPCHAROID:
- case VARCHAROID:
- case TEXTOID:
- case NAMEOID:
- {
- unsigned char *valstr = convert_string_datum(value, valuetypid);
- unsigned char *lostr = convert_string_datum(lobound, boundstypid);
- unsigned char *histr = convert_string_datum(hibound, boundstypid);
-
- convert_string_to_scalar(valstr, scaledvalue,
- lostr, scaledlobound,
- histr, scaledhibound);
- pfree(valstr);
- pfree(lostr);
- pfree(histr);
- return true;
- }
-
- /*
- * Built-in bytea type
- */
- case BYTEAOID:
- {
- convert_bytea_to_scalar(value, scaledvalue,
- lobound, scaledlobound,
- hibound, scaledhibound);
- return true;
- }
-
- /*
- * Built-in time types
- */
- case TIMESTAMPOID:
- case TIMESTAMPTZOID:
- case ABSTIMEOID:
- case DATEOID:
- case INTERVALOID:
- case RELTIMEOID:
- case TINTERVALOID:
- case TIMEOID:
- case TIMETZOID:
- *scaledvalue = convert_timevalue_to_scalar(value, valuetypid);
- *scaledlobound = convert_timevalue_to_scalar(lobound, boundstypid);
- *scaledhibound = convert_timevalue_to_scalar(hibound, boundstypid);
- return true;
-
- /*
- * Built-in network types
- */
- case INETOID:
- case CIDROID:
- case MACADDROID:
- *scaledvalue = convert_network_to_scalar(value, valuetypid);
- *scaledlobound = convert_network_to_scalar(lobound, boundstypid);
- *scaledhibound = convert_network_to_scalar(hibound, boundstypid);
- return true;
- }
- /* Don't know how to convert */
- return false;
-}
-
-/*
- * Do convert_to_scalar()'s work for any numeric data type.
- */
-static double
-convert_numeric_to_scalar(Datum value, Oid typid)
-{
- switch (typid)
- {
- case BOOLOID:
- return (double) DatumGetBool(value);
- case INT2OID:
- return (double) DatumGetInt16(value);
- case INT4OID:
- return (double) DatumGetInt32(value);
- case INT8OID:
- return (double) DatumGetInt64(value);
- case FLOAT4OID:
- return (double) DatumGetFloat4(value);
- case FLOAT8OID:
- return (double) DatumGetFloat8(value);
- case NUMERICOID:
- /* Note: out-of-range values will be clamped to +-HUGE_VAL */
- return (double)
- DatumGetFloat8(DirectFunctionCall1(numeric_float8_no_overflow,
- value));
- case OIDOID:
- case REGPROCOID:
- case REGPROCEDUREOID:
- case REGOPEROID:
- case REGOPERATOROID:
- case REGCLASSOID:
- case REGTYPEOID:
- /* we can treat OIDs as integers... */
- return (double) DatumGetObjectId(value);
- }
-
- /*
- * Can't get here unless someone tries to use scalarltsel/scalargtsel
- * on an operator with one numeric and one non-numeric operand.
- */
- elog(ERROR, "convert_numeric_to_scalar: unsupported type %u", typid);
- return 0;
-}
-
-/*
- * Do convert_to_scalar()'s work for any character-string data type.
- *
- * String datatypes are converted to a scale that ranges from 0 to 1,
- * where we visualize the bytes of the string as fractional digits.
- *
- * We do not want the base to be 256, however, since that tends to
- * generate inflated selectivity estimates; few databases will have
- * occurrences of all 256 possible byte values at each position.
- * Instead, use the smallest and largest byte values seen in the bounds
- * as the estimated range for each byte, after some fudging to deal with
- * the fact that we probably aren't going to see the full range that way.
- *
- * An additional refinement is that we discard any common prefix of the
- * three strings before computing the scaled values. This allows us to
- * "zoom in" when we encounter a narrow data range. An example is a phone
- * number database where all the values begin with the same area code.
- * (Actually, the bounds will be adjacent histogram-bin-boundary values,
- * so this is more likely to happen than you might think.)
- */
-static void
-convert_string_to_scalar(unsigned char *value,
- double *scaledvalue,
- unsigned char *lobound,
- double *scaledlobound,
- unsigned char *hibound,
- double *scaledhibound)
-{
- int rangelo,
- rangehi;
- unsigned char *sptr;
-
- rangelo = rangehi = hibound[0];
- for (sptr = lobound; *sptr; sptr++)
- {
- if (rangelo > *sptr)
- rangelo = *sptr;
- if (rangehi < *sptr)
- rangehi = *sptr;
- }
- for (sptr = hibound; *sptr; sptr++)
- {
- if (rangelo > *sptr)
- rangelo = *sptr;
- if (rangehi < *sptr)
- rangehi = *sptr;
- }
- /* If range includes any upper-case ASCII chars, make it include all */
- if (rangelo <= 'Z' && rangehi >= 'A')
- {
- if (rangelo > 'A')
- rangelo = 'A';
- if (rangehi < 'Z')
- rangehi = 'Z';
- }
- /* Ditto lower-case */
- if (rangelo <= 'z' && rangehi >= 'a')
- {
- if (rangelo > 'a')
- rangelo = 'a';
- if (rangehi < 'z')
- rangehi = 'z';
- }
- /* Ditto digits */
- if (rangelo <= '9' && rangehi >= '0')
- {
- if (rangelo > '0')
- rangelo = '0';
- if (rangehi < '9')
- rangehi = '9';
- }
-
- /*
- * If range includes less than 10 chars, assume we have not got enough
- * data, and make it include regular ASCII set.
- */
- if (rangehi - rangelo < 9)
- {
- rangelo = ' ';
- rangehi = 127;
- }
-
- /*
- * Now strip any common prefix of the three strings.
- */
- while (*lobound)
- {
- if (*lobound != *hibound || *lobound != *value)
- break;
- lobound++, hibound++, value++;
- }
-
- /*
- * Now we can do the conversions.
- */
- *scaledvalue = convert_one_string_to_scalar(value, rangelo, rangehi);
- *scaledlobound = convert_one_string_to_scalar(lobound, rangelo, rangehi);
- *scaledhibound = convert_one_string_to_scalar(hibound, rangelo, rangehi);
-}
-
-static double
-convert_one_string_to_scalar(unsigned char *value, int rangelo, int rangehi)
-{
- int slen = strlen((char *) value);
- double num,
- denom,
- base;
-
- if (slen <= 0)
- return 0.0; /* empty string has scalar value 0 */
-
- /*
- * Since base is at least 10, need not consider more than about 20
- * chars
- */
- if (slen > 20)
- slen = 20;
-
- /* Convert initial characters to fraction */
- base = rangehi - rangelo + 1;
- num = 0.0;
- denom = base;
- while (slen-- > 0)
- {
- int ch = *value++;
-
- if (ch < rangelo)
- ch = rangelo - 1;
- else if (ch > rangehi)
- ch = rangehi + 1;
- num += ((double) (ch - rangelo)) / denom;
- denom *= base;
- }
-
- return num;
-}
-
-/*
- * Convert a string-type Datum into a palloc'd, null-terminated string.
- *
- * When using a non-C locale, we must pass the string through strxfrm()
- * before continuing, so as to generate correct locale-specific results.
- */
-static unsigned char *
-convert_string_datum(Datum value, Oid typid)
-{
- char *val;
- char *xfrmstr;
- size_t xfrmsize;
- size_t xfrmlen;
-
- switch (typid)
- {
- case CHAROID:
- val = (char *) palloc(2);
- val[0] = DatumGetChar(value);
- val[1] = '\0';
- break;
- case BPCHAROID:
- case VARCHAROID:
- case TEXTOID:
- {
- char *str = (char *) VARDATA(DatumGetPointer(value));
- int strlength = VARSIZE(DatumGetPointer(value)) - VARHDRSZ;
-
- val = (char *) palloc(strlength + 1);
- memcpy(val, str, strlength);
- val[strlength] = '\0';
- break;
- }
- case NAMEOID:
- {
- NameData *nm = (NameData *) DatumGetPointer(value);
-
- val = pstrdup(NameStr(*nm));
- break;
- }
- default:
-
- /*
- * Can't get here unless someone tries to use scalarltsel on
- * an operator with one string and one non-string operand.
- */
- elog(ERROR, "convert_string_datum: unsupported type %u", typid);
- return NULL;
- }
-
- if (!lc_collate_is_c())
- {
- /* Guess that transformed string is not much bigger than original */
- xfrmsize = strlen(val) + 32; /* arbitrary pad value here... */
- xfrmstr = (char *) palloc(xfrmsize);
- xfrmlen = strxfrm(xfrmstr, val, xfrmsize);
- if (xfrmlen >= xfrmsize)
- {
- /* Oops, didn't make it */
- pfree(xfrmstr);
- xfrmstr = (char *) palloc(xfrmlen + 1);
- xfrmlen = strxfrm(xfrmstr, val, xfrmlen + 1);
- }
- pfree(val);
- val = xfrmstr;
- }
-
- return (unsigned char *) val;
-}
-
-/*
- * Do convert_to_scalar()'s work for any bytea data type.
- *
- * Very similar to convert_string_to_scalar except we can't assume
- * null-termination and therefore pass explicit lengths around.
- *
- * Also, assumptions about likely "normal" ranges of characters have been
- * removed - a data range of 0..255 is always used, for now. (Perhaps
- * someday we will add information about actual byte data range to
- * pg_statistic.)
- */
-static void
-convert_bytea_to_scalar(Datum value,
- double *scaledvalue,
- Datum lobound,
- double *scaledlobound,
- Datum hibound,
- double *scaledhibound)
-{
- int rangelo,
- rangehi,
- valuelen = VARSIZE(DatumGetPointer(value)) - VARHDRSZ,
- loboundlen = VARSIZE(DatumGetPointer(lobound)) - VARHDRSZ,
- hiboundlen = VARSIZE(DatumGetPointer(hibound)) - VARHDRSZ,
- i,
- minlen;
- unsigned char *valstr = (unsigned char *) VARDATA(DatumGetPointer(value)),
- *lostr = (unsigned char *) VARDATA(DatumGetPointer(lobound)),
- *histr = (unsigned char *) VARDATA(DatumGetPointer(hibound));
-
- /*
- * Assume bytea data is uniformly distributed across all byte values.
- */
- rangelo = 0;
- rangehi = 255;
-
- /*
- * Now strip any common prefix of the three strings.
- */
- minlen = Min(Min(valuelen, loboundlen), hiboundlen);
- for (i = 0; i < minlen; i++)
- {
- if (*lostr != *histr || *lostr != *valstr)
- break;
- lostr++, histr++, valstr++;
- loboundlen--, hiboundlen--, valuelen--;
- }
-
- /*
- * Now we can do the conversions.
- */
- *scaledvalue = convert_one_bytea_to_scalar(valstr, valuelen, rangelo, rangehi);
- *scaledlobound = convert_one_bytea_to_scalar(lostr, loboundlen, rangelo, rangehi);
- *scaledhibound = convert_one_bytea_to_scalar(histr, hiboundlen, rangelo, rangehi);
-}
-
-static double
-convert_one_bytea_to_scalar(unsigned char *value, int valuelen,
- int rangelo, int rangehi)
-{
- double num,
- denom,
- base;
-
- if (valuelen <= 0)
- return 0.0; /* empty string has scalar value 0 */
-
- /*
- * Since base is 256, need not consider more than about 10 chars (even
- * this many seems like overkill)
- */
- if (valuelen > 10)
- valuelen = 10;
-
- /* Convert initial characters to fraction */
- base = rangehi - rangelo + 1;
- num = 0.0;
- denom = base;
- while (valuelen-- > 0)
- {
- int ch = *value++;
-
- if (ch < rangelo)
- ch = rangelo - 1;
- else if (ch > rangehi)
- ch = rangehi + 1;
- num += ((double) (ch - rangelo)) / denom;
- denom *= base;
- }
-
- return num;
-}
-
-/*
- * Do convert_to_scalar()'s work for any timevalue data type.
- */
-static double
-convert_timevalue_to_scalar(Datum value, Oid typid)
-{
- switch (typid)
- {
- case TIMESTAMPOID:
- return DatumGetTimestamp(value);
- case TIMESTAMPTZOID:
- return DatumGetTimestampTz(value);
- case ABSTIMEOID:
- return DatumGetTimestamp(DirectFunctionCall1(abstime_timestamp,
- value));
- case DATEOID:
- return DatumGetTimestamp(DirectFunctionCall1(date_timestamp,
- value));
- case INTERVALOID:
- {
- Interval *interval = DatumGetIntervalP(value);
-
- /*
- * Convert the month part of Interval to days using
- * assumed average month length of 365.25/12.0 days. Not
- * too accurate, but plenty good enough for our purposes.
- */
-#ifdef HAVE_INT64_TIMESTAMP
- return (interval->time + (interval->month * ((365.25 / 12.0) * 86400000000.0)));
-#else
- return interval->time +
- interval->month * (365.25 / 12.0 * 24.0 * 60.0 * 60.0);
-#endif
- }
- case RELTIMEOID:
-#ifdef HAVE_INT64_TIMESTAMP
- return (DatumGetRelativeTime(value) * 1000000.0);
-#else
- return DatumGetRelativeTime(value);
-#endif
- case TINTERVALOID:
- {
- TimeInterval interval = DatumGetTimeInterval(value);
-
-#ifdef HAVE_INT64_TIMESTAMP
- if (interval->status != 0)
- return ((interval->data[1] - interval->data[0]) * 1000000.0);
-#else
- if (interval->status != 0)
- return interval->data[1] - interval->data[0];
-#endif
- return 0; /* for lack of a better idea */
- }
- case TIMEOID:
- return DatumGetTimeADT(value);
- case TIMETZOID:
- {
- TimeTzADT *timetz = DatumGetTimeTzADTP(value);
-
- /* use GMT-equivalent time */
-#ifdef HAVE_INT64_TIMESTAMP
- return (double) (timetz->time + (timetz->zone * 1000000.0));
-#else
- return (double) (timetz->time + timetz->zone);
-#endif
- }
- }
-
- /*
- * Can't get here unless someone tries to use scalarltsel/scalargtsel
- * on an operator with one timevalue and one non-timevalue operand.
- */
- elog(ERROR, "convert_timevalue_to_scalar: unsupported type %u", typid);
- return 0;
-}
-
-
-/*
- * get_att_numdistinct
- * Estimate the number of distinct values of an attribute.
- *
- * var: identifies the attribute to examine.
- * stats: pg_statistic tuple for attribute, or NULL if not available.
- *
- * NB: be careful to produce an integral result, since callers may compare
- * the result to exact integer counts.
- */
-static double
-get_att_numdistinct(Query *root, Var *var, Form_pg_statistic stats)
-{
- RelOptInfo *rel;
- double ntuples;
-
- /*
- * Special-case boolean columns: presumably, two distinct values.
- *
- * Are there any other cases we should wire in special estimates for?
- */
- if (var->vartype == BOOLOID)
- return 2.0;
-
- /*
- * Otherwise we need to get the relation size.
- */
- rel = find_base_rel(root, var->varno);
- ntuples = rel->tuples;
-
- if (ntuples <= 0.0)
- return DEFAULT_NUM_DISTINCT; /* no data available; return a
- * default */
-
- /*
- * Look to see if there is a unique index on the attribute. If so, we
- * assume it's distinct, ignoring pg_statistic info which could be out
- * of date.
- */
- if (has_unique_index(rel, var->varattno))
- return ntuples;
-
- /*
- * If ANALYZE determined a fixed or scaled estimate, use it.
- */
- if (stats)
- {
- if (stats->stadistinct > 0.0)
- return stats->stadistinct;
- if (stats->stadistinct < 0.0)
- return floor((-stats->stadistinct * ntuples) + 0.5);
- }
-
- /*
- * ANALYZE does not compute stats for system attributes, but some of
- * them can reasonably be assumed unique anyway.
- */
- switch (var->varattno)
- {
- case ObjectIdAttributeNumber:
- case SelfItemPointerAttributeNumber:
- return ntuples;
- case TableOidAttributeNumber:
- return 1.0;
- }
-
- /*
- * Estimate ndistinct = ntuples if the table is small, else use
- * default.
- */
- if (ntuples < DEFAULT_NUM_DISTINCT)
- return ntuples;
-
- return DEFAULT_NUM_DISTINCT;
-}
-
-/*
- * get_restriction_var
- * Examine the args of a restriction clause to see if it's of the
- * form (var op something) or (something op var). If so, extract
- * and return the var and the other argument.
- *
- * Inputs:
- * args: clause argument list
- * varRelid: see specs for restriction selectivity functions
- *
- * Outputs: (these are set only if TRUE is returned)
- * *var: gets Var node
- * *other: gets other clause argument
- * *varonleft: set TRUE if var is on the left, FALSE if on the right
- *
- * Returns TRUE if a Var is identified, otherwise FALSE.
- */
-static bool
-get_restriction_var(List *args,
- int varRelid,
- Var **var,
- Node **other,
- bool *varonleft)
-{
- Node *left,
- *right;
-
- if (length(args) != 2)
- return false;
-
- left = (Node *) lfirst(args);
- right = (Node *) lsecond(args);
-
- /* Ignore any binary-compatible relabeling */
-
- if (IsA(left, RelabelType))
- left = ((RelabelType *) left)->arg;
- if (IsA(right, RelabelType))
- right = ((RelabelType *) right)->arg;
-
- /* Look for the var */
-
- if (IsA(left, Var) &&
- (varRelid == 0 || varRelid == ((Var *) left)->varno))
- {
- *var = (Var *) left;
- *other = right;
- *varonleft = true;
- }
- else if (IsA(right, Var) &&
- (varRelid == 0 || varRelid == ((Var *) right)->varno))
- {
- *var = (Var *) right;
- *other = left;
- *varonleft = false;
- }
- else
- {
- /* Duh, it's too complicated for me... */
- return false;
- }
-
- return true;
-}
-
-/*
- * get_join_vars
- *
- * Extract the two Vars from a join clause's argument list. Returns
- * NULL for arguments that are not simple vars.
- */
-static void
-get_join_vars(List *args, Var **var1, Var **var2)
-{
- Node *left,
- *right;
-
- if (length(args) != 2)
- {
- *var1 = NULL;
- *var2 = NULL;
- return;
- }
-
- left = (Node *) lfirst(args);
- right = (Node *) lsecond(args);
-
- /* Ignore any binary-compatible relabeling */
- if (IsA(left, RelabelType))
- left = ((RelabelType *) left)->arg;
- if (IsA(right, RelabelType))
- right = ((RelabelType *) right)->arg;
-
- if (IsA(left, Var))
- *var1 = (Var *) left;
- else
- *var1 = NULL;
-
- if (IsA(right, Var))
- *var2 = (Var *) right;
- else
- *var2 = NULL;
-}
-
-/*-------------------------------------------------------------------------
- *
- * Pattern analysis functions
- *
- * These routines support analysis of LIKE and regular-expression patterns
- * by the planner/optimizer. It's important that they agree with the
- * regular-expression code in backend/regex/ and the LIKE code in
- * backend/utils/adt/like.c.
- *
- * Note that the prefix-analysis functions are called from
- * backend/optimizer/path/indxpath.c as well as from routines in this file.
- *
- *-------------------------------------------------------------------------
- */
-
-/*
- * Extract the fixed prefix, if any, for a pattern.
- * *prefix is set to a palloc'd prefix string,
- * or to NULL if no fixed prefix exists for the pattern.
- * *rest is set to point to the remainder of the pattern after the
- * portion describing the fixed prefix.
- * The return value distinguishes no fixed prefix, a partial prefix,
- * or an exact-match-only pattern.
- */
-
-static Pattern_Prefix_Status
-like_fixed_prefix(char *patt, bool case_insensitive,
- char **prefix, char **rest)
-{
- char *match;
- int pos,
- match_pos;
-
- *prefix = match = palloc(strlen(patt) + 1);
- match_pos = 0;
-
- for (pos = 0; patt[pos]; pos++)
- {
- /* % and _ are wildcard characters in LIKE */
- if (patt[pos] == '%' ||
- patt[pos] == '_')
- break;
- /* Backslash quotes the next character */
- if (patt[pos] == '\\')
- {
- pos++;
- if (patt[pos] == '\0')
- break;
- }
-
- /*
- * XXX I suspect isalpha() is not an adequately locale-sensitive
- * test for characters that can vary under case folding?
- */
- if (case_insensitive && isalpha((unsigned char) patt[pos]))
- break;
-
- /*
- * NOTE: this code used to think that %% meant a literal %, but
- * textlike() itself does not think that, and the SQL92 spec
- * doesn't say any such thing either.
- */
- match[match_pos++] = patt[pos];
- }
-
- match[match_pos] = '\0';
- *rest = &patt[pos];
-
- /* in LIKE, an empty pattern is an exact match! */
- if (patt[pos] == '\0')
- return Pattern_Prefix_Exact; /* reached end of pattern, so
- * exact */
-
- if (match_pos > 0)
- return Pattern_Prefix_Partial;
-
- pfree(match);
- *prefix = NULL;
- return Pattern_Prefix_None;
-}
-
-static Pattern_Prefix_Status
-regex_fixed_prefix(char *patt, bool case_insensitive,
- char **prefix, char **rest)
-{
- char *match;
- int pos,
- match_pos,
- paren_depth;
-
- /* Pattern must be anchored left */
- if (patt[0] != '^')
- {
- *prefix = NULL;
- *rest = patt;
- return Pattern_Prefix_None;
- }
-
- /*
- * If unquoted | is present at paren level 0 in pattern, then there
- * are multiple alternatives for the start of the string.
- */
- paren_depth = 0;
- for (pos = 1; patt[pos]; pos++)
- {
- if (patt[pos] == '|' && paren_depth == 0)
- {
- *prefix = NULL;
- *rest = patt;
- return Pattern_Prefix_None;
- }
- else if (patt[pos] == '(')
- paren_depth++;
- else if (patt[pos] == ')' && paren_depth > 0)
- paren_depth--;
- else if (patt[pos] == '\\')
- {
- /* backslash quotes the next character */
- pos++;
- if (patt[pos] == '\0')
- break;
- }
- }
-
- /* OK, allocate space for pattern */
- *prefix = match = palloc(strlen(patt) + 1);
- match_pos = 0;
-
- /* note start at pos 1 to skip leading ^ */
- for (pos = 1; patt[pos]; pos++)
- {
- /*
- * Check for characters that indicate multiple possible matches
- * here. XXX I suspect isalpha() is not an adequately
- * locale-sensitive test for characters that can vary under case
- * folding?
- */
- if (patt[pos] == '.' ||
- patt[pos] == '(' ||
- patt[pos] == '[' ||
- patt[pos] == '$' ||
- (case_insensitive && isalpha((unsigned char) patt[pos])))
- break;
-
- /*
- * Check for quantifiers. Except for +, this means the preceding
- * character is optional, so we must remove it from the prefix
- * too!
- */
- if (patt[pos] == '*' ||
- patt[pos] == '?' ||
- patt[pos] == '{')
- {
- if (match_pos > 0)
- match_pos--;
- pos--;
- break;
- }
- if (patt[pos] == '+')
- {
- pos--;
- break;
- }
- if (patt[pos] == '\\')
- {
- /* backslash quotes the next character */
- pos++;
- if (patt[pos] == '\0')
- break;
- }
- match[match_pos++] = patt[pos];
- }
-
- match[match_pos] = '\0';
- *rest = &patt[pos];
-
- if (patt[pos] == '$' && patt[pos + 1] == '\0')
- {
- *rest = &patt[pos + 1];
- return Pattern_Prefix_Exact; /* pattern specifies exact match */
- }
-
- if (match_pos > 0)
- return Pattern_Prefix_Partial;
-
- pfree(match);
- *prefix = NULL;
- return Pattern_Prefix_None;
-}
-
-Pattern_Prefix_Status
-pattern_fixed_prefix(char *patt, Pattern_Type ptype,
- char **prefix, char **rest)
-{
- Pattern_Prefix_Status result;
-
- switch (ptype)
- {
- case Pattern_Type_Like:
- result = like_fixed_prefix(patt, false, prefix, rest);
- break;
- case Pattern_Type_Like_IC:
- result = like_fixed_prefix(patt, true, prefix, rest);
- break;
- case Pattern_Type_Regex:
- result = regex_fixed_prefix(patt, false, prefix, rest);
- break;
- case Pattern_Type_Regex_IC:
- result = regex_fixed_prefix(patt, true, prefix, rest);
- break;
- default:
- elog(ERROR, "pattern_fixed_prefix: bogus ptype");
- result = Pattern_Prefix_None; /* keep compiler quiet */
- break;
- }
- return result;
-}
-
-/*
- * Estimate the selectivity of a fixed prefix for a pattern match.
- *
- * A fixed prefix "foo" is estimated as the selectivity of the expression
- * "var >= 'foo' AND var < 'fop'" (see also indxqual.c).
- *
- * XXX Note: we make use of the upper bound to estimate operator selectivity
- * even if the locale is such that we cannot rely on the upper-bound string.
- * The selectivity only needs to be approximately right anyway, so it seems
- * more useful to use the upper-bound code than not.
- */
-static Selectivity
-prefix_selectivity(Query *root, Var *var, char *prefix)
-{
- Selectivity prefixsel;
- Oid cmpopr;
- Const *prefixcon;
- List *cmpargs;
- char *greaterstr;
-
- cmpopr = find_operator(">=", var->vartype);
- if (cmpopr == InvalidOid)
- elog(ERROR, "prefix_selectivity: no >= operator for type %u",
- var->vartype);
- prefixcon = string_to_const(prefix, var->vartype);
- cmpargs = makeList2(var, prefixcon);
- /* Assume scalargtsel is appropriate for all supported types */
- prefixsel = DatumGetFloat8(DirectFunctionCall4(scalargtsel,
- PointerGetDatum(root),
- ObjectIdGetDatum(cmpopr),
- PointerGetDatum(cmpargs),
- Int32GetDatum(0)));
-
- /*-------
- * If we can create a string larger than the prefix, say
- * "x < greaterstr".
- *-------
- */
- greaterstr = make_greater_string(prefix, var->vartype);
- if (greaterstr)
- {
- Selectivity topsel;
-
- cmpopr = find_operator("<", var->vartype);
- if (cmpopr == InvalidOid)
- elog(ERROR, "prefix_selectivity: no < operator for type %u",
- var->vartype);
- prefixcon = string_to_const(greaterstr, var->vartype);
- cmpargs = makeList2(var, prefixcon);
- /* Assume scalarltsel is appropriate for all supported types */
- topsel = DatumGetFloat8(DirectFunctionCall4(scalarltsel,
- PointerGetDatum(root),
- ObjectIdGetDatum(cmpopr),
- PointerGetDatum(cmpargs),
- Int32GetDatum(0)));
-
- /*
- * Merge the two selectivities in the same way as for a range
- * query (see clauselist_selectivity()).
- */
- prefixsel = topsel + prefixsel - 1.0;
-
- /*
- * A zero or slightly negative prefixsel should be converted into
- * a small positive value; we probably are dealing with a very
- * tight range and got a bogus result due to roundoff errors.
- * However, if prefixsel is very negative, then we probably have
- * default selectivity estimates on one or both sides of the
- * range. In that case, insert a not-so-wildly-optimistic default
- * estimate.
- */
- if (prefixsel <= 0.0)
- {
- if (prefixsel < -0.01)
- {
- /*
- * No data available --- use a default estimate that is
- * small, but not real small.
- */
- prefixsel = 0.005;
- }
- else
- {
- /*
- * It's just roundoff error; use a small positive value
- */
- prefixsel = 1.0e-10;
- }
- }
- }
-
- return prefixsel;
-}
-
-
-/*
- * Estimate the selectivity of a pattern of the specified type.
- * Note that any fixed prefix of the pattern will have been removed already.
- *
- * For now, we use a very simplistic approach: fixed characters reduce the
- * selectivity a good deal, character ranges reduce it a little,
- * wildcards (such as % for LIKE or .* for regex) increase it.
- */
-
-#define FIXED_CHAR_SEL 0.20 /* about 1/5 */
-#define CHAR_RANGE_SEL 0.25
-#define ANY_CHAR_SEL 0.9 /* not 1, since it won't match
- * end-of-string */
-#define FULL_WILDCARD_SEL 5.0
-#define PARTIAL_WILDCARD_SEL 2.0
-
-static Selectivity
-like_selectivity(char *patt, bool case_insensitive)
-{
- Selectivity sel = 1.0;
- int pos;
-
- /* Skip any leading %; it's already factored into initial sel */
- pos = (*patt == '%') ? 1 : 0;
- for (; patt[pos]; pos++)
- {
- /* % and _ are wildcard characters in LIKE */
- if (patt[pos] == '%')
- sel *= FULL_WILDCARD_SEL;
- else if (patt[pos] == '_')
- sel *= ANY_CHAR_SEL;
- else if (patt[pos] == '\\')
- {
- /* Backslash quotes the next character */
- pos++;
- if (patt[pos] == '\0')
- break;
- sel *= FIXED_CHAR_SEL;
- }
- else
- sel *= FIXED_CHAR_SEL;
- }
- /* Could get sel > 1 if multiple wildcards */
- if (sel > 1.0)
- sel = 1.0;
- return sel;
-}
-
-static Selectivity
-regex_selectivity_sub(char *patt, int pattlen, bool case_insensitive)
-{
- Selectivity sel = 1.0;
- int paren_depth = 0;
- int paren_pos = 0; /* dummy init to keep compiler quiet */
- int pos;
-
- for (pos = 0; pos < pattlen; pos++)
- {
- if (patt[pos] == '(')
- {
- if (paren_depth == 0)
- paren_pos = pos; /* remember start of parenthesized item */
- paren_depth++;
- }
- else if (patt[pos] == ')' && paren_depth > 0)
- {
- paren_depth--;
- if (paren_depth == 0)
- sel *= regex_selectivity_sub(patt + (paren_pos + 1),
- pos - (paren_pos + 1),
- case_insensitive);
- }
- else if (patt[pos] == '|' && paren_depth == 0)
- {
- /*
- * If unquoted | is present at paren level 0 in pattern, we
- * have multiple alternatives; sum their probabilities.
- */
- sel += regex_selectivity_sub(patt + (pos + 1),
- pattlen - (pos + 1),
- case_insensitive);
- break; /* rest of pattern is now processed */
- }
- else if (patt[pos] == '[')
- {
- bool negclass = false;
-
- if (patt[++pos] == '^')
- {
- negclass = true;
- pos++;
- }
- if (patt[pos] == ']') /* ']' at start of class is not
- * special */
- pos++;
- while (pos < pattlen && patt[pos] != ']')
- pos++;
- if (paren_depth == 0)
- sel *= (negclass ? (1.0 - CHAR_RANGE_SEL) : CHAR_RANGE_SEL);
- }
- else if (patt[pos] == '.')
- {
- if (paren_depth == 0)
- sel *= ANY_CHAR_SEL;
- }
- else if (patt[pos] == '*' ||
- patt[pos] == '?' ||
- patt[pos] == '+')
- {
- /* Ought to be smarter about quantifiers... */
- if (paren_depth == 0)
- sel *= PARTIAL_WILDCARD_SEL;
- }
- else if (patt[pos] == '{')
- {
- while (pos < pattlen && patt[pos] != '}')
- pos++;
- if (paren_depth == 0)
- sel *= PARTIAL_WILDCARD_SEL;
- }
- else if (patt[pos] == '\\')
- {
- /* backslash quotes the next character */
- pos++;
- if (pos >= pattlen)
- break;
- if (paren_depth == 0)
- sel *= FIXED_CHAR_SEL;
- }
- else
- {
- if (paren_depth == 0)
- sel *= FIXED_CHAR_SEL;
- }
- }
- /* Could get sel > 1 if multiple wildcards */
- if (sel > 1.0)
- sel = 1.0;
- return sel;
-}
-
-static Selectivity
-regex_selectivity(char *patt, bool case_insensitive)
-{
- Selectivity sel;
- int pattlen = strlen(patt);
-
- /* If patt doesn't end with $, consider it to have a trailing wildcard */
- if (pattlen > 0 && patt[pattlen - 1] == '$' &&
- (pattlen == 1 || patt[pattlen - 2] != '\\'))
- {
- /* has trailing $ */
- sel = regex_selectivity_sub(patt, pattlen - 1, case_insensitive);
- }
- else
- {
- /* no trailing $ */
- sel = regex_selectivity_sub(patt, pattlen, case_insensitive);
- sel *= FULL_WILDCARD_SEL;
- if (sel > 1.0)
- sel = 1.0;
- }
- return sel;
-}
-
-static Selectivity
-pattern_selectivity(char *patt, Pattern_Type ptype)
-{
- Selectivity result;
-
- switch (ptype)
- {
- case Pattern_Type_Like:
- result = like_selectivity(patt, false);
- break;
- case Pattern_Type_Like_IC:
- result = like_selectivity(patt, true);
- break;
- case Pattern_Type_Regex:
- result = regex_selectivity(patt, false);
- break;
- case Pattern_Type_Regex_IC:
- result = regex_selectivity(patt, true);
- break;
- default:
- elog(ERROR, "pattern_selectivity: bogus ptype");
- result = 1.0; /* keep compiler quiet */
- break;
- }
- return result;
-}
-
-
-/*
- * We want test whether the database's LC_COLLATE setting is safe for
- * LIKE/regexp index optimization.
- *
- * The key requirement here is that given a prefix string, say "foo",
- * we must be able to generate another string "fop" that is greater
- * than all strings "foobar" starting with "foo". Unfortunately, a
- * non-C locale may have arbitrary collation rules in which "fop" >
- * "foo" is not sufficient to ensure "fop" > "foobar". Until we can
- * come up with a more bulletproof way of generating the upper-bound
- * string, the optimization is disabled in all non-C locales.
- *
- * (In theory, locales other than C may be LIKE-safe so this function
- * could be different from lc_collate_is_c(), but in a different
- * theory, non-C locales are completely unpredicable so it's unlikely
- * to happen.)
- *
- * Be sure to maintain the correspondence with the code in initdb.
- */
-bool
-locale_is_like_safe(void)
-{
- return lc_collate_is_c();
-}
-
-/*
- * Try to generate a string greater than the given string or any string it is
- * a prefix of. If successful, return a palloc'd string; else return NULL.
- *
- * To work correctly in non-ASCII locales with weird collation orders,
- * we cannot simply increment "foo" to "fop" --- we have to check whether
- * we actually produced a string greater than the given one. If not,
- * increment the righthand byte again and repeat. If we max out the righthand
- * byte, truncate off the last character and start incrementing the next.
- * For example, if "z" were the last character in the sort order, then we
- * could produce "foo" as a string greater than "fonz".
- *
- * This could be rather slow in the worst case, but in most cases we won't
- * have to try more than one or two strings before succeeding.
- *
- * XXX this is actually not sufficient, since it only copes with the case
- * where individual characters collate in an order different from their
- * numeric code assignments. It does not handle cases where there are
- * cross-character effects, such as specially sorted digraphs, multiple
- * sort passes, etc. For now, we just shut down the whole thing in locales
- * that do such things :-(
- */
-char *
-make_greater_string(const char *str, Oid datatype)
-{
- char *workstr;
- int len;
-
- /*
- * Make a modifiable copy, which will be our return value if
- * successful
- */
- workstr = pstrdup((char *) str);
-
- while ((len = strlen(workstr)) > 0)
- {
- unsigned char *lastchar = (unsigned char *) (workstr + len - 1);
-
- /*
- * Try to generate a larger string by incrementing the last byte.
- */
- while (*lastchar < (unsigned char) 255)
- {
- (*lastchar)++;
- if (string_lessthan(str, workstr, datatype))
- return workstr; /* Success! */
- }
-
- /*
- * Truncate off the last character, which might be more than 1
- * byte in MULTIBYTE case.
- */
-#ifdef MULTIBYTE
- len = pg_mbcliplen((const unsigned char *) workstr, len, len - 1);
- workstr[len] = '\0';
-#else
- *lastchar = '\0';
-#endif
- }
-
- /* Failed... */
- pfree(workstr);
- return NULL;
-}
-
-/*
- * Test whether two strings are "<" according to the rules of the given
- * datatype. We do this the hard way, ie, actually calling the type's
- * "<" operator function, to ensure we get the right result...
- */
-static bool
-string_lessthan(const char *str1, const char *str2, Oid datatype)
-{
- Datum datum1 = string_to_datum(str1, datatype);
- Datum datum2 = string_to_datum(str2, datatype);
- bool result;
-
- switch (datatype)
- {
- case TEXTOID:
- result = DatumGetBool(DirectFunctionCall2(text_lt,
- datum1, datum2));
- break;
-
- case BPCHAROID:
- result = DatumGetBool(DirectFunctionCall2(bpcharlt,
- datum1, datum2));
- break;
-
- case VARCHAROID:
- result = DatumGetBool(DirectFunctionCall2(varcharlt,
- datum1, datum2));
- break;
-
- case NAMEOID:
- result = DatumGetBool(DirectFunctionCall2(namelt,
- datum1, datum2));
- break;
-
- case BYTEAOID:
- result = DatumGetBool(DirectFunctionCall2(bytealt,
- datum1, datum2));
- break;
-
- default:
- elog(ERROR, "string_lessthan: unexpected datatype %u", datatype);
- result = false;
- break;
- }
-
- pfree(DatumGetPointer(datum1));
- pfree(DatumGetPointer(datum2));
-
- return result;
-}
-
-/* See if there is a binary op of the given name for the given datatype */
-/* NB: we assume that only built-in system operators are searched for */
-static Oid
-find_operator(const char *opname, Oid datatype)
-{
- return GetSysCacheOid(OPERNAMENSP,
- PointerGetDatum(opname),
- ObjectIdGetDatum(datatype),
- ObjectIdGetDatum(datatype),
- ObjectIdGetDatum(PG_CATALOG_NAMESPACE));
-}
-
-/*
- * Generate a Datum of the appropriate type from a C string.
- * Note that all of the supported types are pass-by-ref, so the
- * returned value should be pfree'd if no longer needed.
- */
-static Datum
-string_to_datum(const char *str, Oid datatype)
-{
- /*
- * We cheat a little by assuming that textin() will do for bpchar and
- * varchar constants too...
- */
- if (datatype == NAMEOID)
- return DirectFunctionCall1(namein, CStringGetDatum(str));
- else
- return DirectFunctionCall1(textin, CStringGetDatum(str));
-}
-
-/*
- * Generate a Const node of the appropriate type from a C string.
- */
-static Const *
-string_to_const(const char *str, Oid datatype)
-{
- Datum conval = string_to_datum(str, datatype);
-
- return makeConst(datatype, ((datatype == NAMEOID) ? NAMEDATALEN : -1),
- conval, false, false, false, false);
-}
-
-/*-------------------------------------------------------------------------
- *
- * Index cost estimation functions
- *
- * genericcostestimate is a general-purpose estimator for use when we
- * don't have any better idea about how to estimate. Index-type-specific
- * knowledge can be incorporated in the type-specific routines.
- *
- *-------------------------------------------------------------------------
- */
-
-static void
-genericcostestimate(Query *root, RelOptInfo *rel,
- IndexOptInfo *index, List *indexQuals,
- Cost *indexStartupCost,
- Cost *indexTotalCost,
- Selectivity *indexSelectivity,
- double *indexCorrelation)
-{
- double numIndexTuples;
- double numIndexPages;
- List *selectivityQuals = indexQuals;
-
- /*
- * If the index is partial, AND the index predicate with the
- * explicitly given indexquals to produce a more accurate idea of the
- * index restriction. This may produce redundant clauses, which we
- * hope that cnfify and clauselist_selectivity will deal with
- * intelligently.
- *
- * Note that index->indpred and indexQuals are both in implicit-AND form
- * to start with, which we have to make explicit to hand to
- * canonicalize_qual, and then we get back implicit-AND form again.
- */
- if (index->indpred != NIL)
- {
- Expr *andedQuals;
-
- andedQuals = make_ands_explicit(nconc(listCopy(index->indpred),
- indexQuals));
- selectivityQuals = canonicalize_qual(andedQuals, true);
- }
-
- /* Estimate the fraction of main-table tuples that will be visited */
- *indexSelectivity = clauselist_selectivity(root, selectivityQuals,
- lfirsti(rel->relids));
-
- /*
- * Estimate the number of tuples that will be visited. We do it in
- * this rather peculiar-looking way in order to get the right answer
- * for partial indexes. We can bound the number of tuples by the
- * index size, in any case.
- */
- numIndexTuples = *indexSelectivity * rel->tuples;
-
- if (numIndexTuples > index->tuples)
- numIndexTuples = index->tuples;
-
- /*
- * Always estimate at least one tuple is touched, even when
- * indexSelectivity estimate is tiny.
- */
- if (numIndexTuples < 1.0)
- numIndexTuples = 1.0;
-
- /*
- * Estimate the number of index pages that will be retrieved.
- *
- * For all currently-supported index types, the first page of the index
- * is a metadata page, and we should figure on fetching that plus a
- * pro-rated fraction of the remaining pages.
- */
- if (index->pages > 1 && index->tuples > 0)
- {
- numIndexPages = (numIndexTuples / index->tuples) * (index->pages - 1);
- numIndexPages += 1; /* count the metapage too */
- numIndexPages = ceil(numIndexPages);
- }
- else
- numIndexPages = 1.0;
-
- /*
- * Compute the index access cost.
- *
- * Our generic assumption is that the index pages will be read
- * sequentially, so they have cost 1.0 each, not random_page_cost.
- * Also, we charge for evaluation of the indexquals at each index
- * tuple. All the costs are assumed to be paid incrementally during
- * the scan.
- */
- *indexStartupCost = 0;
- *indexTotalCost = numIndexPages +
- (cpu_index_tuple_cost + cost_qual_eval(indexQuals)) * numIndexTuples;
-
- /*
- * Generic assumption about index correlation: there isn't any.
- */
- *indexCorrelation = 0.0;
-}
-
-
-Datum
-btcostestimate(PG_FUNCTION_ARGS)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
- RelOptInfo *rel = (RelOptInfo *) PG_GETARG_POINTER(1);
- IndexOptInfo *index = (IndexOptInfo *) PG_GETARG_POINTER(2);
- List *indexQuals = (List *) PG_GETARG_POINTER(3);
- Cost *indexStartupCost = (Cost *) PG_GETARG_POINTER(4);
- Cost *indexTotalCost = (Cost *) PG_GETARG_POINTER(5);
- Selectivity *indexSelectivity = (Selectivity *) PG_GETARG_POINTER(6);
- double *indexCorrelation = (double *) PG_GETARG_POINTER(7);
-
- genericcostestimate(root, rel, index, indexQuals,
- indexStartupCost, indexTotalCost,
- indexSelectivity, indexCorrelation);
-
- /*
- * If it's a functional index, leave the default zero-correlation
- * estimate in place. If not, and if we can get an estimate for the
- * first variable's ordering correlation C from pg_statistic, estimate
- * the index correlation as C / number-of-columns. (The idea here is
- * that multiple columns dilute the importance of the first column's
- * ordering, but don't negate it entirely.)
- */
- if (index->indproc == InvalidOid)
- {
- Oid relid;
- HeapTuple tuple;
-
- relid = getrelid(lfirsti(rel->relids), root->rtable);
- Assert(relid != InvalidOid);
- tuple = SearchSysCache(STATRELATT,
- ObjectIdGetDatum(relid),
- Int16GetDatum(index->indexkeys[0]),
- 0, 0);
- if (HeapTupleIsValid(tuple))
- {
- Oid typid;
- int32 typmod;
- float4 *numbers;
- int nnumbers;
-
- get_atttypetypmod(relid, index->indexkeys[0],
- &typid, &typmod);
- if (get_attstatsslot(tuple, typid, typmod,
- STATISTIC_KIND_CORRELATION,
- index->ordering[0],
- NULL, NULL, &numbers, &nnumbers))
- {
- double varCorrelation;
- int nKeys;
-
- Assert(nnumbers == 1);
- varCorrelation = numbers[0];
- for (nKeys = 1; index->indexkeys[nKeys] != 0; nKeys++)
- /* skip */ ;
-
- *indexCorrelation = varCorrelation / nKeys;
-
- free_attstatsslot(typid, NULL, 0, numbers, nnumbers);
- }
- ReleaseSysCache(tuple);
- }
- }
-
- PG_RETURN_VOID();
-}
-
-Datum
-rtcostestimate(PG_FUNCTION_ARGS)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
- RelOptInfo *rel = (RelOptInfo *) PG_GETARG_POINTER(1);
- IndexOptInfo *index = (IndexOptInfo *) PG_GETARG_POINTER(2);
- List *indexQuals = (List *) PG_GETARG_POINTER(3);
- Cost *indexStartupCost = (Cost *) PG_GETARG_POINTER(4);
- Cost *indexTotalCost = (Cost *) PG_GETARG_POINTER(5);
- Selectivity *indexSelectivity = (Selectivity *) PG_GETARG_POINTER(6);
- double *indexCorrelation = (double *) PG_GETARG_POINTER(7);
-
- genericcostestimate(root, rel, index, indexQuals,
- indexStartupCost, indexTotalCost,
- indexSelectivity, indexCorrelation);
-
- PG_RETURN_VOID();
-}
-
-Datum
-hashcostestimate(PG_FUNCTION_ARGS)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
- RelOptInfo *rel = (RelOptInfo *) PG_GETARG_POINTER(1);
- IndexOptInfo *index = (IndexOptInfo *) PG_GETARG_POINTER(2);
- List *indexQuals = (List *) PG_GETARG_POINTER(3);
- Cost *indexStartupCost = (Cost *) PG_GETARG_POINTER(4);
- Cost *indexTotalCost = (Cost *) PG_GETARG_POINTER(5);
- Selectivity *indexSelectivity = (Selectivity *) PG_GETARG_POINTER(6);
- double *indexCorrelation = (double *) PG_GETARG_POINTER(7);
-
- genericcostestimate(root, rel, index, indexQuals,
- indexStartupCost, indexTotalCost,
- indexSelectivity, indexCorrelation);
-
- PG_RETURN_VOID();
-}
-
-Datum
-gistcostestimate(PG_FUNCTION_ARGS)
-{
- Query *root = (Query *) PG_GETARG_POINTER(0);
- RelOptInfo *rel = (RelOptInfo *) PG_GETARG_POINTER(1);
- IndexOptInfo *index = (IndexOptInfo *) PG_GETARG_POINTER(2);
- List *indexQuals = (List *) PG_GETARG_POINTER(3);
- Cost *indexStartupCost = (Cost *) PG_GETARG_POINTER(4);
- Cost *indexTotalCost = (Cost *) PG_GETARG_POINTER(5);
- Selectivity *indexSelectivity = (Selectivity *) PG_GETARG_POINTER(6);
- double *indexCorrelation = (double *) PG_GETARG_POINTER(7);
-
- genericcostestimate(root, rel, index, indexQuals,
- indexStartupCost, indexTotalCost,
- indexSelectivity, indexCorrelation);
-
- PG_RETURN_VOID();
-}