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Diffstat (limited to 'src/backend/access/nbtree/nbtcompare.c')
| -rw-r--r-- | src/backend/access/nbtree/nbtcompare.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/src/backend/access/nbtree/nbtcompare.c b/src/backend/access/nbtree/nbtcompare.c deleted file mode 100644 index 2823ee4207d..00000000000 --- a/src/backend/access/nbtree/nbtcompare.c +++ /dev/null @@ -1,151 +0,0 @@ -/*------------------------------------------------------------------------- - * - * nbtcompare.c - * Comparison functions for btree access method. - * - * 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/access/nbtree/nbtcompare.c,v 1.44 2002/06/20 20:29:25 momjian Exp $ - * - * NOTES - * - * These functions are stored in pg_amproc. For each operator class - * defined on btrees, they compute - * - * compare(a, b): - * < 0 if a < b, - * = 0 if a == b, - * > 0 if a > b. - * - * The result is always an int32 regardless of the input datatype. - * - * NOTE: although any negative int32 is acceptable for reporting "<", - * and any positive int32 is acceptable for reporting ">", routines - * that work on 32-bit or wider datatypes can't just return "a - b". - * That could overflow and give the wrong answer. Also, one should not - * return INT_MIN to report "<", since some callers will negate the result. - * - * NOTE: it is critical that the comparison function impose a total order - * on all non-NULL values of the data type, and that the datatype's - * boolean comparison operators (= < >= etc) yield results consistent - * with the comparison routine. Otherwise bad behavior may ensue. - * (For example, the comparison operators must NOT punt when faced with - * NAN or other funny values; you must devise some collation sequence for - * all such values.) If the datatype is not trivial, this is most - * reliably done by having the boolean operators invoke the same - * three-way comparison code that the btree function does. Therefore, - * this file contains only btree support for "trivial" datatypes --- - * all others are in the /utils/adt/ files that implement their datatypes. - * - * NOTE: these routines must not leak memory, since memory allocated - * during an index access won't be recovered till end of query. This - * primarily affects comparison routines for toastable datatypes; - * they have to be careful to free any detoasted copy of an input datum. - *------------------------------------------------------------------------- - */ -#include "postgres.h" - -#include "utils/builtins.h" - - -Datum -btboolcmp(PG_FUNCTION_ARGS) -{ - bool a = PG_GETARG_BOOL(0); - bool b = PG_GETARG_BOOL(1); - - PG_RETURN_INT32((int32) a - (int32) b); -} - -Datum -btint2cmp(PG_FUNCTION_ARGS) -{ - int16 a = PG_GETARG_INT16(0); - int16 b = PG_GETARG_INT16(1); - - PG_RETURN_INT32((int32) a - (int32) b); -} - -Datum -btint4cmp(PG_FUNCTION_ARGS) -{ - int32 a = PG_GETARG_INT32(0); - int32 b = PG_GETARG_INT32(1); - - if (a > b) - PG_RETURN_INT32(1); - else if (a == b) - PG_RETURN_INT32(0); - else - PG_RETURN_INT32(-1); -} - -Datum -btint8cmp(PG_FUNCTION_ARGS) -{ - int64 a = PG_GETARG_INT64(0); - int64 b = PG_GETARG_INT64(1); - - if (a > b) - PG_RETURN_INT32(1); - else if (a == b) - PG_RETURN_INT32(0); - else - PG_RETURN_INT32(-1); -} - -Datum -btoidcmp(PG_FUNCTION_ARGS) -{ - Oid a = PG_GETARG_OID(0); - Oid b = PG_GETARG_OID(1); - - if (a > b) - PG_RETURN_INT32(1); - else if (a == b) - PG_RETURN_INT32(0); - else - PG_RETURN_INT32(-1); -} - -Datum -btoidvectorcmp(PG_FUNCTION_ARGS) -{ - Oid *a = (Oid *) PG_GETARG_POINTER(0); - Oid *b = (Oid *) PG_GETARG_POINTER(1); - int i; - - for (i = 0; i < INDEX_MAX_KEYS; i++) - { - if (a[i] != b[i]) - { - if (a[i] > b[i]) - PG_RETURN_INT32(1); - else - PG_RETURN_INT32(-1); - } - } - PG_RETURN_INT32(0); -} - -Datum -btcharcmp(PG_FUNCTION_ARGS) -{ - char a = PG_GETARG_CHAR(0); - char b = PG_GETARG_CHAR(1); - - /* Be careful to compare chars as unsigned */ - PG_RETURN_INT32((int32) ((uint8) a) - (int32) ((uint8) b)); -} - -Datum -btnamecmp(PG_FUNCTION_ARGS) -{ - Name a = PG_GETARG_NAME(0); - Name b = PG_GETARG_NAME(1); - - PG_RETURN_INT32(strncmp(NameStr(*a), NameStr(*b), NAMEDATALEN)); -} |