From 05dedace84ef8c93fea5309c3ac55f889011429b Mon Sep 17 00:00:00 2001 From: CVS to git conversion script Date: Thu, 20 Jun 2002 20:29:55 +0000 Subject: This commit was manufactured by cvs2git to create branch 'ecpg_big_bison'. Sprout from master 2002-06-20 20:29:54 UTC Bruce Momjian '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/utils/dllinit.c src/utils/getopt.c src/utils/strdup.c src/win32.mak --- src/backend/executor/execMain.c | 1941 --------------------------------------- 1 file changed, 1941 deletions(-) delete mode 100644 src/backend/executor/execMain.c (limited to 'src/backend/executor/execMain.c') diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c deleted file mode 100644 index 27b187f2a5e..00000000000 --- a/src/backend/executor/execMain.c +++ /dev/null @@ -1,1941 +0,0 @@ -/*------------------------------------------------------------------------- - * - * execMain.c - * top level executor interface routines - * - * INTERFACE ROUTINES - * ExecutorStart() - * ExecutorRun() - * ExecutorEnd() - * - * The old ExecutorMain() has been replaced by ExecutorStart(), - * ExecutorRun() and ExecutorEnd() - * - * These three procedures are the external interfaces to the executor. - * In each case, the query descriptor and the execution state is required - * as arguments - * - * ExecutorStart() must be called at the beginning of any execution of any - * query plan and ExecutorEnd() should always be called at the end of - * execution of a plan. - * - * ExecutorRun accepts direction and count arguments that specify whether - * the plan is to be executed forwards, backwards, and for how many tuples. - * - * 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/executor/execMain.c,v 1.165 2002/06/20 20:29:27 momjian Exp $ - * - *------------------------------------------------------------------------- - */ -#include "postgres.h" - -#include "access/heapam.h" -#include "catalog/heap.h" -#include "catalog/namespace.h" -#include "commands/tablecmds.h" -#include "commands/trigger.h" -#include "executor/execdebug.h" -#include "executor/execdefs.h" -#include "miscadmin.h" -#include "optimizer/var.h" -#include "parser/parsetree.h" -#include "utils/acl.h" -#include "utils/lsyscache.h" - - -/* decls for local routines only used within this module */ -static TupleDesc InitPlan(CmdType operation, - Query *parseTree, - Plan *plan, - EState *estate); -static void initResultRelInfo(ResultRelInfo *resultRelInfo, - Index resultRelationIndex, - List *rangeTable, - CmdType operation); -static void EndPlan(Plan *plan, EState *estate); -static TupleTableSlot *ExecutePlan(EState *estate, Plan *plan, - CmdType operation, - long numberTuples, - ScanDirection direction, - DestReceiver *destfunc); -static void ExecRetrieve(TupleTableSlot *slot, - DestReceiver *destfunc, - EState *estate); -static void ExecAppend(TupleTableSlot *slot, ItemPointer tupleid, - EState *estate); -static void ExecDelete(TupleTableSlot *slot, ItemPointer tupleid, - EState *estate); -static void ExecReplace(TupleTableSlot *slot, ItemPointer tupleid, - EState *estate); -static TupleTableSlot *EvalPlanQualNext(EState *estate); -static void EndEvalPlanQual(EState *estate); -static void ExecCheckQueryPerms(CmdType operation, Query *parseTree, - Plan *plan); -static void ExecCheckPlanPerms(Plan *plan, List *rangeTable, - CmdType operation); -static void ExecCheckRTPerms(List *rangeTable, CmdType operation); -static void ExecCheckRTEPerms(RangeTblEntry *rte, CmdType operation); - -/* end of local decls */ - - -/* ---------------------------------------------------------------- - * ExecutorStart - * - * This routine must be called at the beginning of any execution of any - * query plan - * - * returns a TupleDesc which describes the attributes of the tuples to - * be returned by the query. (Same value is saved in queryDesc) - * - * NB: the CurrentMemoryContext when this is called must be the context - * to be used as the per-query context for the query plan. ExecutorRun() - * and ExecutorEnd() must be called in this same memory context. - * ---------------------------------------------------------------- - */ -TupleDesc -ExecutorStart(QueryDesc *queryDesc, EState *estate) -{ - TupleDesc result; - - /* sanity checks */ - Assert(queryDesc != NULL); - - if (queryDesc->plantree->nParamExec > 0) - { - estate->es_param_exec_vals = (ParamExecData *) - palloc(queryDesc->plantree->nParamExec * sizeof(ParamExecData)); - MemSet(estate->es_param_exec_vals, 0, - queryDesc->plantree->nParamExec * sizeof(ParamExecData)); - } - - /* - * Make our own private copy of the current query snapshot data. - * - * This "freezes" our idea of which tuples are good and which are not - * for the life of this query, even if it outlives the current command - * and current snapshot. - */ - estate->es_snapshot = CopyQuerySnapshot(); - - /* - * Initialize the plan - */ - result = InitPlan(queryDesc->operation, - queryDesc->parsetree, - queryDesc->plantree, - estate); - - queryDesc->tupDesc = result; - - return result; -} - -/* ---------------------------------------------------------------- - * ExecutorRun - * - * This is the main routine of the executor module. It accepts - * the query descriptor from the traffic cop and executes the - * query plan. - * - * ExecutorStart must have been called already. - * - * If direction is NoMovementScanDirection then nothing is done - * except to start up/shut down the destination. Otherwise, - * we retrieve up to 'count' tuples in the specified direction. - * - * Note: count = 0 is interpreted as no portal limit, e.g. run to - * completion. - * - * ---------------------------------------------------------------- - */ -TupleTableSlot * -ExecutorRun(QueryDesc *queryDesc, EState *estate, - ScanDirection direction, long count) -{ - CmdType operation; - Plan *plan; - CommandDest dest; - DestReceiver *destfunc; - TupleTableSlot *result; - - /* - * sanity checks - */ - Assert(queryDesc != NULL); - - /* - * extract information from the query descriptor and the query - * feature. - */ - operation = queryDesc->operation; - plan = queryDesc->plantree; - dest = queryDesc->dest; - - /* - * startup tuple receiver - */ - estate->es_processed = 0; - estate->es_lastoid = InvalidOid; - - destfunc = DestToFunction(dest); - (*destfunc->setup) (destfunc, (int) operation, - queryDesc->portalName, queryDesc->tupDesc); - - /* - * run plan - */ - if (direction == NoMovementScanDirection) - result = NULL; - else - result = ExecutePlan(estate, - plan, - operation, - count, - direction, - destfunc); - - /* - * shutdown receiver - */ - (*destfunc->cleanup) (destfunc); - - return result; -} - -/* ---------------------------------------------------------------- - * ExecutorEnd - * - * This routine must be called at the end of execution of any - * query plan - * ---------------------------------------------------------------- - */ -void -ExecutorEnd(QueryDesc *queryDesc, EState *estate) -{ - /* sanity checks */ - Assert(queryDesc != NULL); - - EndPlan(queryDesc->plantree, estate); - - if (estate->es_snapshot != NULL) - { - if (estate->es_snapshot->xcnt > 0) - pfree(estate->es_snapshot->xip); - pfree(estate->es_snapshot); - estate->es_snapshot = NULL; - } - - if (estate->es_param_exec_vals != NULL) - { - pfree(estate->es_param_exec_vals); - estate->es_param_exec_vals = NULL; - } -} - - -/* - * ExecCheckQueryPerms - * Check access permissions for all relations referenced in a query. - */ -static void -ExecCheckQueryPerms(CmdType operation, Query *parseTree, Plan *plan) -{ - /* - * Check RTEs in the query's primary rangetable. - */ - ExecCheckRTPerms(parseTree->rtable, operation); - - /* - * Search for subplans and APPEND nodes to check their rangetables. - */ - ExecCheckPlanPerms(plan, parseTree->rtable, operation); -} - -/* - * ExecCheckPlanPerms - * Recursively scan the plan tree to check access permissions in - * subplans. - */ -static void -ExecCheckPlanPerms(Plan *plan, List *rangeTable, CmdType operation) -{ - List *subp; - - if (plan == NULL) - return; - - /* Check subplans, which we assume are plain SELECT queries */ - - foreach(subp, plan->initPlan) - { - SubPlan *subplan = (SubPlan *) lfirst(subp); - - ExecCheckRTPerms(subplan->rtable, CMD_SELECT); - ExecCheckPlanPerms(subplan->plan, subplan->rtable, CMD_SELECT); - } - foreach(subp, plan->subPlan) - { - SubPlan *subplan = (SubPlan *) lfirst(subp); - - ExecCheckRTPerms(subplan->rtable, CMD_SELECT); - ExecCheckPlanPerms(subplan->plan, subplan->rtable, CMD_SELECT); - } - - /* Check lower plan nodes */ - - ExecCheckPlanPerms(plan->lefttree, rangeTable, operation); - ExecCheckPlanPerms(plan->righttree, rangeTable, operation); - - /* Do node-type-specific checks */ - - switch (nodeTag(plan)) - { - case T_SubqueryScan: - { - SubqueryScan *scan = (SubqueryScan *) plan; - RangeTblEntry *rte; - - /* Recursively check the subquery */ - rte = rt_fetch(scan->scan.scanrelid, rangeTable); - Assert(rte->rtekind == RTE_SUBQUERY); - ExecCheckQueryPerms(operation, rte->subquery, scan->subplan); - break; - } - case T_Append: - { - Append *app = (Append *) plan; - List *appendplans; - - foreach(appendplans, app->appendplans) - { - ExecCheckPlanPerms((Plan *) lfirst(appendplans), - rangeTable, - operation); - } - break; - } - - default: - break; - } -} - -/* - * ExecCheckRTPerms - * Check access permissions for all relations listed in a range table. - */ -static void -ExecCheckRTPerms(List *rangeTable, CmdType operation) -{ - List *lp; - - foreach(lp, rangeTable) - { - RangeTblEntry *rte = lfirst(lp); - - ExecCheckRTEPerms(rte, operation); - } -} - -/* - * ExecCheckRTEPerms - * Check access permissions for a single RTE. - */ -static void -ExecCheckRTEPerms(RangeTblEntry *rte, CmdType operation) -{ - Oid relOid; - Oid userid; - AclResult aclcheck_result; - - /* - * Only plain-relation RTEs need to be checked here. Subquery RTEs - * will be checked when ExecCheckPlanPerms finds the SubqueryScan node, - * and function RTEs are checked by init_fcache when the function is - * prepared for execution. Join and special RTEs need no checks. - */ - if (rte->rtekind != RTE_RELATION) - return; - - relOid = rte->relid; - - /* - * userid to check as: current user unless we have a setuid - * indication. - * - * Note: GetUserId() is presently fast enough that there's no harm in - * calling it separately for each RTE. If that stops being true, we - * could call it once in ExecCheckQueryPerms and pass the userid down - * from there. But for now, no need for the extra clutter. - */ - userid = rte->checkAsUser ? rte->checkAsUser : GetUserId(); - -#define CHECK(MODE) pg_class_aclcheck(relOid, userid, MODE) - - if (rte->checkForRead) - { - aclcheck_result = CHECK(ACL_SELECT); - if (aclcheck_result != ACLCHECK_OK) - aclcheck_error(aclcheck_result, get_rel_name(relOid)); - } - - if (rte->checkForWrite) - { - /* - * Note: write access in a SELECT context means SELECT FOR UPDATE. - * Right now we don't distinguish that from true update as far as - * permissions checks are concerned. - */ - switch (operation) - { - case CMD_INSERT: - aclcheck_result = CHECK(ACL_INSERT); - break; - case CMD_SELECT: - case CMD_UPDATE: - aclcheck_result = CHECK(ACL_UPDATE); - break; - case CMD_DELETE: - aclcheck_result = CHECK(ACL_DELETE); - break; - default: - elog(ERROR, "ExecCheckRTEPerms: bogus operation %d", - operation); - aclcheck_result = ACLCHECK_OK; /* keep compiler quiet */ - break; - } - if (aclcheck_result != ACLCHECK_OK) - aclcheck_error(aclcheck_result, get_rel_name(relOid)); - } -} - - -/* =============================================================== - * =============================================================== - static routines follow - * =============================================================== - * =============================================================== - */ - -typedef struct execRowMark -{ - Relation relation; - Index rti; - char resname[32]; -} execRowMark; - -typedef struct evalPlanQual -{ - Plan *plan; - Index rti; - EState estate; - struct evalPlanQual *free; -} evalPlanQual; - -/* ---------------------------------------------------------------- - * InitPlan - * - * Initializes the query plan: open files, allocate storage - * and start up the rule manager - * ---------------------------------------------------------------- - */ -static TupleDesc -InitPlan(CmdType operation, Query *parseTree, Plan *plan, EState *estate) -{ - List *rangeTable; - Relation intoRelationDesc; - TupleDesc tupType; - - /* - * Do permissions checks. - */ - ExecCheckQueryPerms(operation, parseTree, plan); - - /* - * get information from query descriptor - */ - rangeTable = parseTree->rtable; - - /* - * initialize the node's execution state - */ - estate->es_range_table = rangeTable; - - /* - * if there is a result relation, initialize result relation stuff - */ - if (parseTree->resultRelation != 0 && operation != CMD_SELECT) - { - List *resultRelations = parseTree->resultRelations; - int numResultRelations; - ResultRelInfo *resultRelInfos; - - if (resultRelations != NIL) - { - /* - * Multiple result relations (due to inheritance) - * parseTree->resultRelations identifies them all - */ - ResultRelInfo *resultRelInfo; - - numResultRelations = length(resultRelations); - resultRelInfos = (ResultRelInfo *) - palloc(numResultRelations * sizeof(ResultRelInfo)); - resultRelInfo = resultRelInfos; - while (resultRelations != NIL) - { - initResultRelInfo(resultRelInfo, - lfirsti(resultRelations), - rangeTable, - operation); - resultRelInfo++; - resultRelations = lnext(resultRelations); - } - } - else - { - /* - * Single result relation identified by - * parseTree->resultRelation - */ - numResultRelations = 1; - resultRelInfos = (ResultRelInfo *) palloc(sizeof(ResultRelInfo)); - initResultRelInfo(resultRelInfos, - parseTree->resultRelation, - rangeTable, - operation); - } - - estate->es_result_relations = resultRelInfos; - estate->es_num_result_relations = numResultRelations; - /* Initialize to first or only result rel */ - estate->es_result_relation_info = resultRelInfos; - } - else - { - /* - * if no result relation, then set state appropriately - */ - estate->es_result_relations = NULL; - estate->es_num_result_relations = 0; - estate->es_result_relation_info = NULL; - } - - /* - * Have to lock relations selected for update - */ - estate->es_rowMark = NIL; - if (parseTree->rowMarks != NIL) - { - List *l; - - foreach(l, parseTree->rowMarks) - { - Index rti = lfirsti(l); - Oid relid = getrelid(rti, rangeTable); - Relation relation; - execRowMark *erm; - - relation = heap_open(relid, RowShareLock); - erm = (execRowMark *) palloc(sizeof(execRowMark)); - erm->relation = relation; - erm->rti = rti; - sprintf(erm->resname, "ctid%u", rti); - estate->es_rowMark = lappend(estate->es_rowMark, erm); - } - } - - /* - * initialize the executor "tuple" table. We need slots for all the - * plan nodes, plus possibly output slots for the junkfilter(s). At - * this point we aren't sure if we need junkfilters, so just add slots - * for them unconditionally. - */ - { - int nSlots = ExecCountSlotsNode(plan); - - if (parseTree->resultRelations != NIL) - nSlots += length(parseTree->resultRelations); - else - nSlots += 1; - estate->es_tupleTable = ExecCreateTupleTable(nSlots); - } - - /* mark EvalPlanQual not active */ - estate->es_origPlan = plan; - estate->es_evalPlanQual = NULL; - estate->es_evTuple = NULL; - estate->es_evTupleNull = NULL; - estate->es_useEvalPlan = false; - - /* - * initialize the private state information for all the nodes in the - * query tree. This opens files, allocates storage and leaves us - * ready to start processing tuples. - */ - ExecInitNode(plan, estate, NULL); - - /* - * Get the tuple descriptor describing the type of tuples to return. - * (this is especially important if we are creating a relation with - * "retrieve into") - */ - tupType = ExecGetTupType(plan); /* tuple descriptor */ - - /* - * Initialize the junk filter if needed. SELECT and INSERT queries - * need a filter if there are any junk attrs in the tlist. UPDATE and - * DELETE always need one, since there's always a junk 'ctid' - * attribute present --- no need to look first. - */ - { - bool junk_filter_needed = false; - List *tlist; - - switch (operation) - { - case CMD_SELECT: - case CMD_INSERT: - foreach(tlist, plan->targetlist) - { - TargetEntry *tle = (TargetEntry *) lfirst(tlist); - - if (tle->resdom->resjunk) - { - junk_filter_needed = true; - break; - } - } - break; - case CMD_UPDATE: - case CMD_DELETE: - junk_filter_needed = true; - break; - default: - break; - } - - if (junk_filter_needed) - { - /* - * If there are multiple result relations, each one needs its - * own junk filter. Note this is only possible for - * UPDATE/DELETE, so we can't be fooled by some needing a - * filter and some not. - */ - if (parseTree->resultRelations != NIL) - { - List *subplans; - ResultRelInfo *resultRelInfo; - - /* Top plan had better be an Append here. */ - Assert(IsA(plan, Append)); - Assert(((Append *) plan)->isTarget); - subplans = ((Append *) plan)->appendplans; - Assert(length(subplans) == estate->es_num_result_relations); - resultRelInfo = estate->es_result_relations; - while (subplans != NIL) - { - Plan *subplan = (Plan *) lfirst(subplans); - JunkFilter *j; - - j = ExecInitJunkFilter(subplan->targetlist, - ExecGetTupType(subplan), - ExecAllocTableSlot(estate->es_tupleTable)); - resultRelInfo->ri_junkFilter = j; - resultRelInfo++; - subplans = lnext(subplans); - } - - /* - * Set active junkfilter too; at this point ExecInitAppend - * has already selected an active result relation... - */ - estate->es_junkFilter = - estate->es_result_relation_info->ri_junkFilter; - } - else - { - /* Normal case with just one JunkFilter */ - JunkFilter *j; - - j = ExecInitJunkFilter(plan->targetlist, - tupType, - ExecAllocTableSlot(estate->es_tupleTable)); - estate->es_junkFilter = j; - if (estate->es_result_relation_info) - estate->es_result_relation_info->ri_junkFilter = j; - - /* For SELECT, want to return the cleaned tuple type */ - if (operation == CMD_SELECT) - tupType = j->jf_cleanTupType; - } - } - else - estate->es_junkFilter = NULL; - } - - /* - * initialize the "into" relation - */ - intoRelationDesc = (Relation) NULL; - - if (operation == CMD_SELECT) - { - if (!parseTree->isPortal) - { - /* - * a select into table --- need to create the "into" table - */ - if (parseTree->into != NULL) - { - char *intoName; - Oid namespaceId; - Oid intoRelationId; - TupleDesc tupdesc; - - /* - * find namespace to create in, check permissions - */ - intoName = parseTree->into->relname; - namespaceId = RangeVarGetCreationNamespace(parseTree->into); - - if (!isTempNamespace(namespaceId)) - { - AclResult aclresult; - - aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), - ACL_CREATE); - if (aclresult != ACLCHECK_OK) - aclcheck_error(aclresult, - get_namespace_name(namespaceId)); - } - - /* - * have to copy tupType to get rid of constraints - */ - tupdesc = CreateTupleDescCopy(tupType); - - intoRelationId = - heap_create_with_catalog(intoName, - namespaceId, - tupdesc, - RELKIND_RELATION, - false, - true, - allowSystemTableMods); - - FreeTupleDesc(tupdesc); - - /* - * Advance command counter so that the newly-created - * relation's catalog tuples will be visible to heap_open. - */ - CommandCounterIncrement(); - - /* - * If necessary, create a TOAST table for the into - * relation. Note that AlterTableCreateToastTable ends - * with CommandCounterIncrement(), so that the TOAST table - * will be visible for insertion. - */ - AlterTableCreateToastTable(intoRelationId, true); - - intoRelationDesc = heap_open(intoRelationId, - AccessExclusiveLock); - } - } - } - - estate->es_into_relation_descriptor = intoRelationDesc; - - return tupType; -} - -/* - * Initialize ResultRelInfo data for one result relation - */ -static void -initResultRelInfo(ResultRelInfo *resultRelInfo, - Index resultRelationIndex, - List *rangeTable, - CmdType operation) -{ - Oid resultRelationOid; - Relation resultRelationDesc; - - resultRelationOid = getrelid(resultRelationIndex, rangeTable); - resultRelationDesc = heap_open(resultRelationOid, RowExclusiveLock); - - switch (resultRelationDesc->rd_rel->relkind) - { - case RELKIND_SEQUENCE: - elog(ERROR, "You can't change sequence relation %s", - RelationGetRelationName(resultRelationDesc)); - break; - case RELKIND_TOASTVALUE: - elog(ERROR, "You can't change toast relation %s", - RelationGetRelationName(resultRelationDesc)); - break; - case RELKIND_VIEW: - elog(ERROR, "You can't change view relation %s", - RelationGetRelationName(resultRelationDesc)); - break; - } - - MemSet(resultRelInfo, 0, sizeof(ResultRelInfo)); - resultRelInfo->type = T_ResultRelInfo; - resultRelInfo->ri_RangeTableIndex = resultRelationIndex; - resultRelInfo->ri_RelationDesc = resultRelationDesc; - resultRelInfo->ri_NumIndices = 0; - resultRelInfo->ri_IndexRelationDescs = NULL; - resultRelInfo->ri_IndexRelationInfo = NULL; - resultRelInfo->ri_TrigDesc = resultRelationDesc->trigdesc; - resultRelInfo->ri_TrigFunctions = NULL; - resultRelInfo->ri_ConstraintExprs = NULL; - resultRelInfo->ri_junkFilter = NULL; - - /* - * If there are indices on the result relation, open them and save - * descriptors in the result relation info, so that we can add new - * index entries for the tuples we add/update. We need not do this - * for a DELETE, however, since deletion doesn't affect indexes. - */ - if (resultRelationDesc->rd_rel->relhasindex && - operation != CMD_DELETE) - ExecOpenIndices(resultRelInfo); -} - -/* ---------------------------------------------------------------- - * EndPlan - * - * Cleans up the query plan -- closes files and free up storages - * ---------------------------------------------------------------- - */ -static void -EndPlan(Plan *plan, EState *estate) -{ - ResultRelInfo *resultRelInfo; - int i; - List *l; - - /* - * shut down any PlanQual processing we were doing - */ - if (estate->es_evalPlanQual != NULL) - EndEvalPlanQual(estate); - - /* - * shut down the node-type-specific query processing - */ - ExecEndNode(plan, NULL); - - /* - * destroy the executor "tuple" table. - */ - ExecDropTupleTable(estate->es_tupleTable, true); - estate->es_tupleTable = NULL; - - /* - * close the result relation(s) if any, but hold locks until xact - * commit. Also clean up junkfilters if present. - */ - resultRelInfo = estate->es_result_relations; - for (i = estate->es_num_result_relations; i > 0; i--) - { - /* Close indices and then the relation itself */ - ExecCloseIndices(resultRelInfo); - heap_close(resultRelInfo->ri_RelationDesc, NoLock); - /* Delete the junkfilter if any */ - if (resultRelInfo->ri_junkFilter != NULL) - ExecFreeJunkFilter(resultRelInfo->ri_junkFilter); - resultRelInfo++; - } - - /* - * close the "into" relation if necessary, again keeping lock - */ - if (estate->es_into_relation_descriptor != NULL) - heap_close(estate->es_into_relation_descriptor, NoLock); - - /* - * There might be a junkfilter without a result relation. - */ - if (estate->es_num_result_relations == 0 && - estate->es_junkFilter != NULL) - { - ExecFreeJunkFilter(estate->es_junkFilter); - estate->es_junkFilter = NULL; - } - - /* - * close any relations selected FOR UPDATE, again keeping locks - */ - foreach(l, estate->es_rowMark) - { - execRowMark *erm = lfirst(l); - - heap_close(erm->relation, NoLock); - } -} - -/* ---------------------------------------------------------------- - * ExecutePlan - * - * processes the query plan to retrieve 'numberTuples' tuples in the - * direction specified. - * Retrieves all tuples if numberTuples is 0 - * - * result is either a slot containing the last tuple in the case - * of a RETRIEVE or NULL otherwise. - * - * Note: the ctid attribute is a 'junk' attribute that is removed before the - * user can see it - * ---------------------------------------------------------------- - */ -static TupleTableSlot * -ExecutePlan(EState *estate, - Plan *plan, - CmdType operation, - long numberTuples, - ScanDirection direction, - DestReceiver *destfunc) -{ - JunkFilter *junkfilter; - TupleTableSlot *slot; - ItemPointer tupleid = NULL; - ItemPointerData tuple_ctid; - long current_tuple_count; - TupleTableSlot *result; - - /* - * initialize local variables - */ - slot = NULL; - current_tuple_count = 0; - result = NULL; - - /* - * Set the direction. - */ - estate->es_direction = direction; - - /* - * Loop until we've processed the proper number of tuples from the - * plan. - */ - - for (;;) - { - /* Reset the per-output-tuple exprcontext */ - ResetPerTupleExprContext(estate); - - /* - * Execute the plan and obtain a tuple - */ -lnext: ; - if (estate->es_useEvalPlan) - { - slot = EvalPlanQualNext(estate); - if (TupIsNull(slot)) - slot = ExecProcNode(plan, NULL); - } - else - slot = ExecProcNode(plan, NULL); - - /* - * if the tuple is null, then we assume there is nothing more to - * process so we just return null... - */ - if (TupIsNull(slot)) - { - result = NULL; - break; - } - - /* - * if we have a junk filter, then project a new tuple with the - * junk removed. - * - * Store this new "clean" tuple in the junkfilter's resultSlot. - * (Formerly, we stored it back over the "dirty" tuple, which is - * WRONG because that tuple slot has the wrong descriptor.) - * - * Also, extract all the junk information we need. - */ - if ((junkfilter = estate->es_junkFilter) != (JunkFilter *) NULL) - { - Datum datum; - HeapTuple newTuple; - bool isNull; - - /* - * extract the 'ctid' junk attribute. - */ - if (operation == CMD_UPDATE || operation == CMD_DELETE) - { - if (!ExecGetJunkAttribute(junkfilter, - slot, - "ctid", - &datum, - &isNull)) - elog(ERROR, "ExecutePlan: NO (junk) `ctid' was found!"); - - /* shouldn't ever get a null result... */ - if (isNull) - elog(ERROR, "ExecutePlan: (junk) `ctid' is NULL!"); - - tupleid = (ItemPointer) DatumGetPointer(datum); - tuple_ctid = *tupleid; /* make sure we don't free the - * ctid!! */ - tupleid = &tuple_ctid; - } - else if (estate->es_rowMark != NIL) - { - List *l; - - lmark: ; - foreach(l, estate->es_rowMark) - { - execRowMark *erm = lfirst(l); - Buffer buffer; - HeapTupleData tuple; - TupleTableSlot *newSlot; - int test; - - if (!ExecGetJunkAttribute(junkfilter, - slot, - erm->resname, - &datum, - &isNull)) - elog(ERROR, "ExecutePlan: NO (junk) `%s' was found!", - erm->resname); - - /* shouldn't ever get a null result... */ - if (isNull) - elog(ERROR, "ExecutePlan: (junk) `%s' is NULL!", - erm->resname); - - tuple.t_self = *((ItemPointer) DatumGetPointer(datum)); - test = heap_mark4update(erm->relation, &tuple, &buffer, - estate->es_snapshot->curcid); - ReleaseBuffer(buffer); - switch (test) - { - case HeapTupleSelfUpdated: - case HeapTupleMayBeUpdated: - break; - - case HeapTupleUpdated: - if (XactIsoLevel == XACT_SERIALIZABLE) - elog(ERROR, "Can't serialize access due to concurrent update"); - if (!(ItemPointerEquals(&(tuple.t_self), - (ItemPointer) DatumGetPointer(datum)))) - { - newSlot = EvalPlanQual(estate, erm->rti, &(tuple.t_self)); - if (!(TupIsNull(newSlot))) - { - slot = newSlot; - estate->es_useEvalPlan = true; - goto lmark; - } - } - - /* - * if tuple was deleted or PlanQual failed for - * updated tuple - we must not return this - * tuple! - */ - goto lnext; - - default: - elog(ERROR, "Unknown status %u from heap_mark4update", test); - return (NULL); - } - } - } - - /* - * Finally create a new "clean" tuple with all junk attributes - * removed - */ - newTuple = ExecRemoveJunk(junkfilter, slot); - - slot = ExecStoreTuple(newTuple, /* tuple to store */ - junkfilter->jf_resultSlot, /* dest slot */ - InvalidBuffer, /* this tuple has no - * buffer */ - true); /* tuple should be pfreed */ - } /* if (junkfilter... */ - - /* - * now that we have a tuple, do the appropriate thing with it.. - * either return it to the user, add it to a relation someplace, - * delete it from a relation, or modify some of its attributes. - */ - - switch (operation) - { - case CMD_SELECT: - ExecRetrieve(slot, /* slot containing tuple */ - destfunc, /* destination's tuple-receiver - * obj */ - estate); /* */ - result = slot; - break; - - case CMD_INSERT: - ExecAppend(slot, tupleid, estate); - result = NULL; - break; - - case CMD_DELETE: - ExecDelete(slot, tupleid, estate); - result = NULL; - break; - - case CMD_UPDATE: - ExecReplace(slot, tupleid, estate); - result = NULL; - break; - - default: - elog(LOG, "ExecutePlan: unknown operation in queryDesc"); - result = NULL; - break; - } - - /* - * check our tuple count.. if we've processed the proper number - * then quit, else loop again and process more tuples.. - */ - current_tuple_count++; - if (numberTuples == current_tuple_count) - break; - } - - /* - * here, result is either a slot containing a tuple in the case of a - * RETRIEVE or NULL otherwise. - */ - return result; -} - -/* ---------------------------------------------------------------- - * ExecRetrieve - * - * RETRIEVEs are easy.. we just pass the tuple to the appropriate - * print function. The only complexity is when we do a - * "retrieve into", in which case we insert the tuple into - * the appropriate relation (note: this is a newly created relation - * so we don't need to worry about indices or locks.) - * ---------------------------------------------------------------- - */ -static void -ExecRetrieve(TupleTableSlot *slot, - DestReceiver *destfunc, - EState *estate) -{ - HeapTuple tuple; - TupleDesc attrtype; - - /* - * get the heap tuple out of the tuple table slot - */ - tuple = slot->val; - attrtype = slot->ttc_tupleDescriptor; - - /* - * insert the tuple into the "into relation" - */ - if (estate->es_into_relation_descriptor != NULL) - { - heap_insert(estate->es_into_relation_descriptor, tuple, - estate->es_snapshot->curcid); - IncrAppended(); - } - - /* - * send the tuple to the front end (or the screen) - */ - (*destfunc->receiveTuple) (tuple, attrtype, destfunc); - IncrRetrieved(); - (estate->es_processed)++; -} - -/* ---------------------------------------------------------------- - * ExecAppend - * - * APPENDs are trickier.. we have to insert the tuple into - * the base relation and insert appropriate tuples into the - * index relations. - * ---------------------------------------------------------------- - */ - -static void -ExecAppend(TupleTableSlot *slot, - ItemPointer tupleid, - EState *estate) -{ - HeapTuple tuple; - ResultRelInfo *resultRelInfo; - Relation resultRelationDesc; - int numIndices; - Oid newId; - - /* - * get the heap tuple out of the tuple table slot - */ - tuple = slot->val; - - /* - * get information on the (current) result relation - */ - resultRelInfo = estate->es_result_relation_info; - resultRelationDesc = resultRelInfo->ri_RelationDesc; - - /* BEFORE ROW INSERT Triggers */ - if (resultRelInfo->ri_TrigDesc && - resultRelInfo->ri_TrigDesc->n_before_row[TRIGGER_EVENT_INSERT] > 0) - { - HeapTuple newtuple; - - newtuple = ExecBRInsertTriggers(estate, resultRelInfo, tuple); - - if (newtuple == NULL) /* "do nothing" */ - return; - - if (newtuple != tuple) /* modified by Trigger(s) */ - { - /* - * Insert modified tuple into tuple table slot, replacing the - * original. We assume that it was allocated in per-tuple - * memory context, and therefore will go away by itself. The - * tuple table slot should not try to clear it. - */ - ExecStoreTuple(newtuple, slot, InvalidBuffer, false); - tuple = newtuple; - } - } - - /* - * Check the constraints of the tuple - */ - if (resultRelationDesc->rd_att->constr) - ExecConstraints("ExecAppend", resultRelInfo, slot, estate); - - /* - * insert the tuple - */ - newId = heap_insert(resultRelationDesc, tuple, - estate->es_snapshot->curcid); - - IncrAppended(); - (estate->es_processed)++; - estate->es_lastoid = newId; - setLastTid(&(tuple->t_self)); - - /* - * process indices - * - * Note: heap_insert adds a new tuple to a relation. As a side effect, - * the tupleid of the new tuple is placed in the new tuple's t_ctid - * field. - */ - numIndices = resultRelInfo->ri_NumIndices; - if (numIndices > 0) - ExecInsertIndexTuples(slot, &(tuple->t_self), estate, false); - - /* AFTER ROW INSERT Triggers */ - if (resultRelInfo->ri_TrigDesc) - ExecARInsertTriggers(estate, resultRelInfo, tuple); -} - -/* ---------------------------------------------------------------- - * ExecDelete - * - * DELETE is like append, we delete the tuple and its - * index tuples. - * ---------------------------------------------------------------- - */ -static void -ExecDelete(TupleTableSlot *slot, - ItemPointer tupleid, - EState *estate) -{ - ResultRelInfo *resultRelInfo; - Relation resultRelationDesc; - ItemPointerData ctid; - int result; - - /* - * get information on the (current) result relation - */ - resultRelInfo = estate->es_result_relation_info; - resultRelationDesc = resultRelInfo->ri_RelationDesc; - - /* BEFORE ROW DELETE Triggers */ - if (resultRelInfo->ri_TrigDesc && - resultRelInfo->ri_TrigDesc->n_before_row[TRIGGER_EVENT_DELETE] > 0) - { - bool dodelete; - - dodelete = ExecBRDeleteTriggers(estate, resultRelInfo, tupleid); - - if (!dodelete) /* "do nothing" */ - return; - } - - /* - * delete the tuple - */ -ldelete:; - result = heap_delete(resultRelationDesc, tupleid, - &ctid, - estate->es_snapshot->curcid); - switch (result) - { - case HeapTupleSelfUpdated: - return; - - case HeapTupleMayBeUpdated: - break; - - case HeapTupleUpdated: - if (XactIsoLevel == XACT_SERIALIZABLE) - elog(ERROR, "Can't serialize access due to concurrent update"); - else if (!(ItemPointerEquals(tupleid, &ctid))) - { - TupleTableSlot *epqslot = EvalPlanQual(estate, - resultRelInfo->ri_RangeTableIndex, &ctid); - - if (!TupIsNull(epqslot)) - { - *tupleid = ctid; - goto ldelete; - } - } - /* tuple already deleted; nothing to do */ - return; - - default: - elog(ERROR, "Unknown status %u from heap_delete", result); - return; - } - - IncrDeleted(); - (estate->es_processed)++; - - /* - * Note: Normally one would think that we have to delete index tuples - * associated with the heap tuple now.. - * - * ... but in POSTGRES, we have no need to do this because the vacuum - * daemon automatically opens an index scan and deletes index tuples - * when it finds deleted heap tuples. -cim 9/27/89 - */ - - /* AFTER ROW DELETE Triggers */ - if (resultRelInfo->ri_TrigDesc) - ExecARDeleteTriggers(estate, resultRelInfo, tupleid); -} - -/* ---------------------------------------------------------------- - * ExecReplace - * - * note: we can't run replace queries with transactions - * off because replaces are actually appends and our - * scan will mistakenly loop forever, replacing the tuple - * it just appended.. This should be fixed but until it - * is, we don't want to get stuck in an infinite loop - * which corrupts your database.. - * ---------------------------------------------------------------- - */ -static void -ExecReplace(TupleTableSlot *slot, - ItemPointer tupleid, - EState *estate) -{ - HeapTuple tuple; - ResultRelInfo *resultRelInfo; - Relation resultRelationDesc; - ItemPointerData ctid; - int result; - int numIndices; - - /* - * abort the operation if not running transactions - */ - if (IsBootstrapProcessingMode()) - { - elog(WARNING, "ExecReplace: replace can't run without transactions"); - return; - } - - /* - * get the heap tuple out of the tuple table slot - */ - tuple = slot->val; - - /* - * get information on the (current) result relation - */ - resultRelInfo = estate->es_result_relation_info; - resultRelationDesc = resultRelInfo->ri_RelationDesc; - - /* BEFORE ROW UPDATE Triggers */ - if (resultRelInfo->ri_TrigDesc && - resultRelInfo->ri_TrigDesc->n_before_row[TRIGGER_EVENT_UPDATE] > 0) - { - HeapTuple newtuple; - - newtuple = ExecBRUpdateTriggers(estate, resultRelInfo, - tupleid, tuple); - - if (newtuple == NULL) /* "do nothing" */ - return; - - if (newtuple != tuple) /* modified by Trigger(s) */ - { - /* - * Insert modified tuple into tuple table slot, replacing the - * original. We assume that it was allocated in per-tuple - * memory context, and therefore will go away by itself. The - * tuple table slot should not try to clear it. - */ - ExecStoreTuple(newtuple, slot, InvalidBuffer, false); - tuple = newtuple; - } - } - - /* - * Check the constraints of the tuple - * - * If we generate a new candidate tuple after EvalPlanQual testing, we - * must loop back here and recheck constraints. (We don't need to - * redo triggers, however. If there are any BEFORE triggers then - * trigger.c will have done mark4update to lock the correct tuple, so - * there's no need to do them again.) - */ -lreplace:; - if (resultRelationDesc->rd_att->constr) - ExecConstraints("ExecReplace", resultRelInfo, slot, estate); - - /* - * replace the heap tuple - */ - result = heap_update(resultRelationDesc, tupleid, tuple, - &ctid, - estate->es_snapshot->curcid); - switch (result) - { - case HeapTupleSelfUpdated: - return; - - case HeapTupleMayBeUpdated: - break; - - case HeapTupleUpdated: - if (XactIsoLevel == XACT_SERIALIZABLE) - elog(ERROR, "Can't serialize access due to concurrent update"); - else if (!(ItemPointerEquals(tupleid, &ctid))) - { - TupleTableSlot *epqslot = EvalPlanQual(estate, - resultRelInfo->ri_RangeTableIndex, &ctid); - - if (!TupIsNull(epqslot)) - { - *tupleid = ctid; - tuple = ExecRemoveJunk(estate->es_junkFilter, epqslot); - slot = ExecStoreTuple(tuple, - estate->es_junkFilter->jf_resultSlot, - InvalidBuffer, true); - goto lreplace; - } - } - /* tuple already deleted; nothing to do */ - return; - - default: - elog(ERROR, "Unknown status %u from heap_update", result); - return; - } - - IncrReplaced(); - (estate->es_processed)++; - - /* - * Note: instead of having to update the old index tuples associated - * with the heap tuple, all we do is form and insert new index tuples. - * This is because replaces are actually deletes and inserts and index - * tuple deletion is done automagically by the vacuum daemon. All we - * do is insert new index tuples. -cim 9/27/89 - */ - - /* - * process indices - * - * heap_update updates a tuple in the base relation by invalidating it - * and then appending a new tuple to the relation. As a side effect, - * the tupleid of the new tuple is placed in the new tuple's t_ctid - * field. So we now insert index tuples using the new tupleid stored - * there. - */ - - numIndices = resultRelInfo->ri_NumIndices; - if (numIndices > 0) - ExecInsertIndexTuples(slot, &(tuple->t_self), estate, false); - - /* AFTER ROW UPDATE Triggers */ - if (resultRelInfo->ri_TrigDesc) - ExecARUpdateTriggers(estate, resultRelInfo, tupleid, tuple); -} - -static char * -ExecRelCheck(ResultRelInfo *resultRelInfo, - TupleTableSlot *slot, EState *estate) -{ - Relation rel = resultRelInfo->ri_RelationDesc; - int ncheck = rel->rd_att->constr->num_check; - ConstrCheck *check = rel->rd_att->constr->check; - ExprContext *econtext; - MemoryContext oldContext; - List *qual; - int i; - - /* - * If first time through for this result relation, build expression - * nodetrees for rel's constraint expressions. Keep them in the - * per-query memory context so they'll survive throughout the query. - */ - if (resultRelInfo->ri_ConstraintExprs == NULL) - { - oldContext = MemoryContextSwitchTo(estate->es_query_cxt); - resultRelInfo->ri_ConstraintExprs = - (List **) palloc(ncheck * sizeof(List *)); - for (i = 0; i < ncheck; i++) - { - qual = (List *) stringToNode(check[i].ccbin); - resultRelInfo->ri_ConstraintExprs[i] = qual; - } - MemoryContextSwitchTo(oldContext); - } - - /* - * We will use the EState's per-tuple context for evaluating - * constraint expressions (creating it if it's not already there). - */ - econtext = GetPerTupleExprContext(estate); - - /* Arrange for econtext's scan tuple to be the tuple under test */ - econtext->ecxt_scantuple = slot; - - /* And evaluate the constraints */ - for (i = 0; i < ncheck; i++) - { - qual = resultRelInfo->ri_ConstraintExprs[i]; - - /* - * NOTE: SQL92 specifies that a NULL result from a constraint - * expression is not to be treated as a failure. Therefore, tell - * ExecQual to return TRUE for NULL. - */ - if (!ExecQual(qual, econtext, true)) - return check[i].ccname; - } - - /* NULL result means no error */ - return (char *) NULL; -} - -void -ExecConstraints(char *caller, ResultRelInfo *resultRelInfo, - TupleTableSlot *slot, EState *estate) -{ - Relation rel = resultRelInfo->ri_RelationDesc; - HeapTuple tuple = slot->val; - TupleConstr *constr = rel->rd_att->constr; - - Assert(constr); - - if (constr->has_not_null) - { - int natts = rel->rd_att->natts; - int attrChk; - - for (attrChk = 1; attrChk <= natts; attrChk++) - { - if (rel->rd_att->attrs[attrChk - 1]->attnotnull && - heap_attisnull(tuple, attrChk)) - elog(ERROR, "%s: Fail to add null value in not null attribute %s", - caller, NameStr(rel->rd_att->attrs[attrChk - 1]->attname)); - } - } - - if (constr->num_check > 0) - { - char *failed; - - if ((failed = ExecRelCheck(resultRelInfo, slot, estate)) != NULL) - elog(ERROR, "%s: rejected due to CHECK constraint %s", - caller, failed); - } -} - -/* - * Check a modified tuple to see if we want to process its updated version - * under READ COMMITTED rules. - * - * See backend/executor/README for some info about how this works. - */ -TupleTableSlot * -EvalPlanQual(EState *estate, Index rti, ItemPointer tid) -{ - evalPlanQual *epq; - EState *epqstate; - Relation relation; - HeapTupleData tuple; - HeapTuple copyTuple = NULL; - int rtsize; - bool endNode; - - Assert(rti != 0); - - /* - * find relation containing target tuple - */ - if (estate->es_result_relation_info != NULL && - estate->es_result_relation_info->ri_RangeTableIndex == rti) - relation = estate->es_result_relation_info->ri_RelationDesc; - else - { - List *l; - - relation = NULL; - foreach(l, estate->es_rowMark) - { - if (((execRowMark *) lfirst(l))->rti == rti) - { - relation = ((execRowMark *) lfirst(l))->relation; - break; - } - } - if (relation == NULL) - elog(ERROR, "EvalPlanQual: can't find RTE %d", (int) rti); - } - - /* - * fetch tid tuple - * - * Loop here to deal with updated or busy tuples - */ - tuple.t_self = *tid; - for (;;) - { - Buffer buffer; - - if (heap_fetch(relation, SnapshotDirty, &tuple, &buffer, false, NULL)) - { - TransactionId xwait = SnapshotDirty->xmax; - - if (TransactionIdIsValid(SnapshotDirty->xmin)) - elog(ERROR, "EvalPlanQual: t_xmin is uncommitted ?!"); - - /* - * If tuple is being updated by other transaction then we have - * to wait for its commit/abort. - */ - if (TransactionIdIsValid(xwait)) - { - ReleaseBuffer(buffer); - XactLockTableWait(xwait); - continue; - } - - /* - * We got tuple - now copy it for use by recheck query. - */ - copyTuple = heap_copytuple(&tuple); - ReleaseBuffer(buffer); - break; - } - - /* - * Oops! Invalid tuple. Have to check is it updated or deleted. - * Note that it's possible to get invalid SnapshotDirty->tid if - * tuple updated by this transaction. Have we to check this ? - */ - if (ItemPointerIsValid(&(SnapshotDirty->tid)) && - !(ItemPointerEquals(&(tuple.t_self), &(SnapshotDirty->tid)))) - { - /* updated, so look at the updated copy */ - tuple.t_self = SnapshotDirty->tid; - continue; - } - - /* - * Deleted or updated by this transaction; forget it. - */ - return NULL; - } - - /* - * For UPDATE/DELETE we have to return tid of actual row we're - * executing PQ for. - */ - *tid = tuple.t_self; - - /* - * Need to run a recheck subquery. Find or create a PQ stack entry. - */ - epq = (evalPlanQual *) estate->es_evalPlanQual; - rtsize = length(estate->es_range_table); - endNode = true; - - if (epq != NULL && epq->rti == 0) - { - /* Top PQ stack entry is idle, so re-use it */ - Assert(!(estate->es_useEvalPlan) && - epq->estate.es_evalPlanQual == NULL); - epq->rti = rti; - endNode = false; - } - - /* - * If this is request for another RTE - Ra, - then we have to check - * wasn't PlanQual requested for Ra already and if so then Ra' row was - * updated again and we have to re-start old execution for Ra and - * forget all what we done after Ra was suspended. Cool? -:)) - */ - if (epq != NULL && epq->rti != rti && - epq->estate.es_evTuple[rti - 1] != NULL) - { - do - { - evalPlanQual *oldepq; - - /* pop previous PlanQual from the stack */ - epqstate = &(epq->estate); - oldepq = (evalPlanQual *) epqstate->es_evalPlanQual; - Assert(oldepq->rti != 0); - /* stop execution */ - ExecEndNode(epq->plan, NULL); - ExecDropTupleTable(epqstate->es_tupleTable, true); - epqstate->es_tupleTable = NULL; - heap_freetuple(epqstate->es_evTuple[epq->rti - 1]); - epqstate->es_evTuple[epq->rti - 1] = NULL; - /* push current PQ to freePQ stack */ - oldepq->free = epq; - epq = oldepq; - estate->es_evalPlanQual = (Pointer) epq; - } while (epq->rti != rti); - } - - /* - * If we are requested for another RTE then we have to suspend - * execution of current PlanQual and start execution for new one. - */ - if (epq == NULL || epq->rti != rti) - { - /* try to reuse plan used previously */ - evalPlanQual *newepq = (epq != NULL) ? epq->free : NULL; - - if (newepq == NULL) /* first call or freePQ stack is empty */ - { - newepq = (evalPlanQual *) palloc(sizeof(evalPlanQual)); - newepq->free = NULL; - - /* - * Each stack level has its own copy of the plan tree. This - * is wasteful, but necessary as long as plan nodes point to - * exec state nodes rather than vice versa. Note that - * copyfuncs.c doesn't attempt to copy the exec state nodes, - * which is a good thing in this situation. - */ - newepq->plan = copyObject(estate->es_origPlan); - - /* - * Init stack level's EState. We share top level's copy of - * es_result_relations array and other non-changing status. We - * need our own tupletable, es_param_exec_vals, and other - * changeable state. - */ - epqstate = &(newepq->estate); - memcpy(epqstate, estate, sizeof(EState)); - epqstate->es_direction = ForwardScanDirection; - if (estate->es_origPlan->nParamExec > 0) - epqstate->es_param_exec_vals = (ParamExecData *) - palloc(estate->es_origPlan->nParamExec * - sizeof(ParamExecData)); - epqstate->es_tupleTable = NULL; - epqstate->es_per_tuple_exprcontext = NULL; - - /* - * Each epqstate must have its own es_evTupleNull state, but - * all the stack entries share es_evTuple state. This allows - * sub-rechecks to inherit the value being examined by an - * outer recheck. - */ - epqstate->es_evTupleNull = (bool *) palloc(rtsize * sizeof(bool)); - if (epq == NULL) - { - /* first PQ stack entry */ - epqstate->es_evTuple = (HeapTuple *) - palloc(rtsize * sizeof(HeapTuple)); - memset(epqstate->es_evTuple, 0, rtsize * sizeof(HeapTuple)); - } - else - { - /* later stack entries share the same storage */ - epqstate->es_evTuple = epq->estate.es_evTuple; - } - } - else - { - /* recycle previously used EState */ - epqstate = &(newepq->estate); - } - /* push current PQ to the stack */ - epqstate->es_evalPlanQual = (Pointer) epq; - epq = newepq; - estate->es_evalPlanQual = (Pointer) epq; - epq->rti = rti; - endNode = false; - } - - Assert(epq->rti == rti); - epqstate = &(epq->estate); - - /* - * Ok - we're requested for the same RTE. Unfortunately we still have - * to end and restart execution of the plan, because ExecReScan - * wouldn't ensure that upper plan nodes would reset themselves. We - * could make that work if insertion of the target tuple were - * integrated with the Param mechanism somehow, so that the upper plan - * nodes know that their children's outputs have changed. - */ - if (endNode) - { - /* stop execution */ - ExecEndNode(epq->plan, NULL); - ExecDropTupleTable(epqstate->es_tupleTable, true); - epqstate->es_tupleTable = NULL; - } - - /* - * free old RTE' tuple, if any, and store target tuple where - * relation's scan node will see it - */ - if (epqstate->es_evTuple[rti - 1] != NULL) - heap_freetuple(epqstate->es_evTuple[rti - 1]); - epqstate->es_evTuple[rti - 1] = copyTuple; - - /* - * Initialize for new recheck query; be careful to copy down state - * that might have changed in top EState. - */ - epqstate->es_result_relation_info = estate->es_result_relation_info; - epqstate->es_junkFilter = estate->es_junkFilter; - if (estate->es_origPlan->nParamExec > 0) - memset(epqstate->es_param_exec_vals, 0, - estate->es_origPlan->nParamExec * sizeof(ParamExecData)); - memset(epqstate->es_evTupleNull, false, rtsize * sizeof(bool)); - epqstate->es_useEvalPlan = false; - Assert(epqstate->es_tupleTable == NULL); - epqstate->es_tupleTable = - ExecCreateTupleTable(estate->es_tupleTable->size); - - ExecInitNode(epq->plan, epqstate, NULL); - - return EvalPlanQualNext(estate); -} - -static TupleTableSlot * -EvalPlanQualNext(EState *estate) -{ - evalPlanQual *epq = (evalPlanQual *) estate->es_evalPlanQual; - EState *epqstate = &(epq->estate); - evalPlanQual *oldepq; - TupleTableSlot *slot; - - Assert(epq->rti != 0); - -lpqnext:; - slot = ExecProcNode(epq->plan, NULL); - - /* - * No more tuples for this PQ. Continue previous one. - */ - if (TupIsNull(slot)) - { - /* stop execution */ - ExecEndNode(epq->plan, NULL); - ExecDropTupleTable(epqstate->es_tupleTable, true); - epqstate->es_tupleTable = NULL; - heap_freetuple(epqstate->es_evTuple[epq->rti - 1]); - epqstate->es_evTuple[epq->rti - 1] = NULL; - /* pop old PQ from the stack */ - oldepq = (evalPlanQual *) epqstate->es_evalPlanQual; - if (oldepq == (evalPlanQual *) NULL) - { - epq->rti = 0; /* this is the first (oldest) */ - estate->es_useEvalPlan = false; /* PQ - mark as free and */ - return (NULL); /* continue Query execution */ - } - Assert(oldepq->rti != 0); - /* push current PQ to freePQ stack */ - oldepq->free = epq; - epq = oldepq; - epqstate = &(epq->estate); - estate->es_evalPlanQual = (Pointer) epq; - goto lpqnext; - } - - return (slot); -} - -static void -EndEvalPlanQual(EState *estate) -{ - evalPlanQual *epq = (evalPlanQual *) estate->es_evalPlanQual; - EState *epqstate = &(epq->estate); - evalPlanQual *oldepq; - - if (epq->rti == 0) /* plans already shutdowned */ - { - Assert(epq->estate.es_evalPlanQual == NULL); - return; - } - - for (;;) - { - /* stop execution */ - ExecEndNode(epq->plan, NULL); - ExecDropTupleTable(epqstate->es_tupleTable, true); - epqstate->es_tupleTable = NULL; - if (epqstate->es_evTuple[epq->rti - 1] != NULL) - { - heap_freetuple(epqstate->es_evTuple[epq->rti - 1]); - epqstate->es_evTuple[epq->rti - 1] = NULL; - } - /* pop old PQ from the stack */ - oldepq = (evalPlanQual *) epqstate->es_evalPlanQual; - if (oldepq == (evalPlanQual *) NULL) - { - epq->rti = 0; /* this is the first (oldest) */ - estate->es_useEvalPlan = false; /* PQ - mark as free */ - break; - } - Assert(oldepq->rti != 0); - /* push current PQ to freePQ stack */ - oldepq->free = epq; - epq = oldepq; - epqstate = &(epq->estate); - estate->es_evalPlanQual = (Pointer) epq; - } -} -- cgit v1.2.3