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88381ade63
yet, though). Avoid using nth() to fetch tlist entries; provide a common routine get_tle_by_resno() to search a tlist for a particular resno. This replaces a couple uses of nth() and a dozen hand-coded search loops. Also, replace a few uses of nth(length-1, list) with llast().
119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* not_in.c
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* Executes the "not_in" operator for any data type
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*
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/not_in.c,v 1.36 2003/08/11 20:46:46 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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/*
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*
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* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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* X HACK WARNING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! X
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* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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*
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* This code is the OLD not-in code that is HACKED
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* into place until operators that can have arguments as
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* columns are ******REALLY****** implemented!!!!!!!!!!!
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*
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*/
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#include "postgres.h"
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#include "access/heapam.h"
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#include "catalog/namespace.h"
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#include "parser/parse_relation.h"
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#include "utils/builtins.h"
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/* ----------------------------------------------------------------
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*
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* ----------------------------------------------------------------
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*/
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Datum
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int4notin(PG_FUNCTION_ARGS)
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{
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int32 not_in_arg = PG_GETARG_INT32(0);
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text *relation_and_attr = PG_GETARG_TEXT_P(1);
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List *names;
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int nnames;
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RangeVar *relrv;
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char *attribute;
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Relation relation_to_scan;
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int32 integer_value;
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HeapTuple current_tuple;
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HeapScanDesc scan_descriptor;
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bool isNull,
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retval;
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int attrid;
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Datum value;
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/* Parse the argument */
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names = textToQualifiedNameList(relation_and_attr, "int4notin");
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nnames = length(names);
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if (nnames < 2)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_NAME),
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errmsg("invalid name syntax"),
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errhint("Must provide \"relationname.attributename\".")));
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attribute = strVal(llast(names));
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names = ltruncate(nnames - 1, names);
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relrv = makeRangeVarFromNameList(names);
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/* Open the relation and get a relation descriptor */
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relation_to_scan = heap_openrv(relrv, AccessShareLock);
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/* Find the column to search */
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attrid = attnameAttNum(relation_to_scan, attribute, true);
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scan_descriptor = heap_beginscan(relation_to_scan, SnapshotNow,
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0, (ScanKey) NULL);
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retval = true;
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/* do a scan of the relation, and do the check */
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while ((current_tuple = heap_getnext(scan_descriptor, ForwardScanDirection)) != NULL)
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{
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value = heap_getattr(current_tuple,
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(AttrNumber) attrid,
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RelationGetDescr(relation_to_scan),
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&isNull);
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if (isNull)
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continue;
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integer_value = DatumGetInt32(value);
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if (not_in_arg == integer_value)
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{
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retval = false;
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break; /* can stop scanning now */
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}
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}
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/* close the relation */
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heap_endscan(scan_descriptor);
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heap_close(relation_to_scan, AccessShareLock);
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PG_RETURN_BOOL(retval);
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}
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Datum
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oidnotin(PG_FUNCTION_ARGS)
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{
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Oid the_oid = PG_GETARG_OID(0);
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#ifdef NOT_USED
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text *relation_and_attr = PG_GETARG_TEXT_P(1);
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#endif
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if (the_oid == InvalidOid)
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PG_RETURN_BOOL(false);
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/* XXX assume oid maps to int4 */
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return int4notin(fcinfo);
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}
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