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-rw-r--r--src/backend/parser/parse_oper.c166
1 files changed, 81 insertions, 85 deletions
diff --git a/src/backend/parser/parse_oper.c b/src/backend/parser/parse_oper.c
index 15a39dc84bc..318f1b9eb7e 100644
--- a/src/backend/parser/parse_oper.c
+++ b/src/backend/parser/parse_oper.c
@@ -8,15 +8,17 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/parser/parse_oper.c,v 1.51 2001/10/25 05:49:40 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/parser/parse_oper.c,v 1.52 2002/02/19 20:11:15 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
+#include "access/genam.h"
#include "access/heapam.h"
#include "catalog/catname.h"
+#include "catalog/indexing.h"
#include "catalog/pg_operator.h"
#include "parser/parse_coerce.h"
#include "parser/parse_func.h"
@@ -80,13 +82,11 @@ static int
binary_oper_get_candidates(char *opname,
CandidateList *candidates)
{
- CandidateList current_candidate;
Relation pg_operator_desc;
- HeapScanDesc pg_operator_scan;
+ SysScanDesc pg_operator_scan;
HeapTuple tup;
- Form_pg_operator oper;
int ncandidates = 0;
- ScanKeyData opKey[2];
+ ScanKeyData opKey[1];
*candidates = NULL;
@@ -95,38 +95,94 @@ binary_oper_get_candidates(char *opname,
F_NAMEEQ,
NameGetDatum(opname));
- ScanKeyEntryInitialize(&opKey[1], 0,
- Anum_pg_operator_oprkind,
- F_CHAREQ,
- CharGetDatum('b'));
-
pg_operator_desc = heap_openr(OperatorRelationName, AccessShareLock);
- pg_operator_scan = heap_beginscan(pg_operator_desc,
- 0,
- SnapshotSelf, /* ??? */
- 2,
- opKey);
+ pg_operator_scan = systable_beginscan(pg_operator_desc,
+ OperatorNameIndex, true,
+ SnapshotNow,
+ 1, opKey);
- while (HeapTupleIsValid(tup = heap_getnext(pg_operator_scan, 0)))
+ while (HeapTupleIsValid(tup = systable_getnext(pg_operator_scan)))
{
- oper = (Form_pg_operator) GETSTRUCT(tup);
+ Form_pg_operator oper = (Form_pg_operator) GETSTRUCT(tup);
+
+ if (oper->oprkind == 'b')
+ {
+ CandidateList current_candidate;
- current_candidate = (CandidateList) palloc(sizeof(struct _CandidateList));
- current_candidate->args = (Oid *) palloc(2 * sizeof(Oid));
+ current_candidate = (CandidateList) palloc(sizeof(struct _CandidateList));
+ current_candidate->args = (Oid *) palloc(2 * sizeof(Oid));
- current_candidate->args[0] = oper->oprleft;
- current_candidate->args[1] = oper->oprright;
- current_candidate->next = *candidates;
- *candidates = current_candidate;
- ncandidates++;
+ current_candidate->args[0] = oper->oprleft;
+ current_candidate->args[1] = oper->oprright;
+ current_candidate->next = *candidates;
+ *candidates = current_candidate;
+ ncandidates++;
+ }
}
- heap_endscan(pg_operator_scan);
+ systable_endscan(pg_operator_scan);
heap_close(pg_operator_desc, AccessShareLock);
return ncandidates;
} /* binary_oper_get_candidates() */
+/* unary_oper_get_candidates()
+ * given opname, find all possible types for which
+ * a right/left unary operator named opname exists.
+ * Build a list of the candidate input types.
+ * Returns number of candidates found.
+ */
+static int
+unary_oper_get_candidates(char *opname,
+ CandidateList *candidates,
+ char rightleft)
+{
+ Relation pg_operator_desc;
+ SysScanDesc pg_operator_scan;
+ HeapTuple tup;
+ int ncandidates = 0;
+ ScanKeyData opKey[1];
+
+ *candidates = NULL;
+
+ ScanKeyEntryInitialize(&opKey[0], 0,
+ Anum_pg_operator_oprname,
+ F_NAMEEQ,
+ NameGetDatum(opname));
+
+ pg_operator_desc = heap_openr(OperatorRelationName, AccessShareLock);
+ pg_operator_scan = systable_beginscan(pg_operator_desc,
+ OperatorNameIndex, true,
+ SnapshotNow,
+ 1, opKey);
+
+ while (HeapTupleIsValid(tup = systable_getnext(pg_operator_scan)))
+ {
+ Form_pg_operator oper = (Form_pg_operator) GETSTRUCT(tup);
+
+ if (oper->oprkind == rightleft)
+ {
+ CandidateList current_candidate;
+
+ current_candidate = (CandidateList) palloc(sizeof(struct _CandidateList));
+ current_candidate->args = (Oid *) palloc(sizeof(Oid));
+
+ if (rightleft == 'r')
+ current_candidate->args[0] = oper->oprleft;
+ else
+ current_candidate->args[0] = oper->oprright;
+ current_candidate->next = *candidates;
+ *candidates = current_candidate;
+ ncandidates++;
+ }
+ }
+
+ systable_endscan(pg_operator_scan);
+ heap_close(pg_operator_desc, AccessShareLock);
+
+ return ncandidates;
+} /* unary_oper_get_candidates() */
+
/* oper_select_candidate()
* Given the input argtype array and one or more candidates
@@ -739,66 +795,6 @@ compatible_oper_funcid(char *op, Oid arg1, Oid arg2, bool noError)
return InvalidOid;
}
-/* unary_oper_get_candidates()
- * given opname, find all possible types for which
- * a right/left unary operator named opname exists.
- * Build a list of the candidate input types.
- * Returns number of candidates found.
- */
-static int
-unary_oper_get_candidates(char *opname,
- CandidateList *candidates,
- char rightleft)
-{
- CandidateList current_candidate;
- Relation pg_operator_desc;
- HeapScanDesc pg_operator_scan;
- HeapTuple tup;
- Form_pg_operator oper;
- int ncandidates = 0;
- ScanKeyData opKey[2];
-
- *candidates = NULL;
-
- ScanKeyEntryInitialize(&opKey[0], 0,
- Anum_pg_operator_oprname,
- F_NAMEEQ,
- NameGetDatum(opname));
-
- ScanKeyEntryInitialize(&opKey[1], 0,
- Anum_pg_operator_oprkind,
- F_CHAREQ,
- CharGetDatum(rightleft));
-
- pg_operator_desc = heap_openr(OperatorRelationName, AccessShareLock);
- pg_operator_scan = heap_beginscan(pg_operator_desc,
- 0,
- SnapshotSelf, /* ??? */
- 2,
- opKey);
-
- while (HeapTupleIsValid(tup = heap_getnext(pg_operator_scan, 0)))
- {
- oper = (Form_pg_operator) GETSTRUCT(tup);
-
- current_candidate = (CandidateList) palloc(sizeof(struct _CandidateList));
- current_candidate->args = (Oid *) palloc(sizeof(Oid));
-
- if (rightleft == 'r')
- current_candidate->args[0] = oper->oprleft;
- else
- current_candidate->args[0] = oper->oprright;
- current_candidate->next = *candidates;
- *candidates = current_candidate;
- ncandidates++;
- }
-
- heap_endscan(pg_operator_scan);
- heap_close(pg_operator_desc, AccessShareLock);
-
- return ncandidates;
-} /* unary_oper_get_candidates() */
-
/* Given unary right operator (operator on right), return oper struct
*
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-16 20:07:30 +0000