1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*-------------------------------------------------------------------------
*
* not_in.c
* Executes the "not_in" operator for any data type
*
* 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/Attic/not_in.c,v 1.34 2003/08/04 00:43:25 momjian Exp $
*
*-------------------------------------------------------------------------
*/
/*
*
* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
* X HACK WARNING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! X
* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*
* This code is the OLD not-in code that is HACKED
* into place until operators that can have arguments as
* columns are ******REALLY****** implemented!!!!!!!!!!!
*
*/
#include "postgres.h"
#include "access/heapam.h"
#include "catalog/namespace.h"
#include "parser/parse_relation.h"
#include "utils/builtins.h"
/* ----------------------------------------------------------------
*
* ----------------------------------------------------------------
*/
Datum
int4notin(PG_FUNCTION_ARGS)
{
int32 not_in_arg = PG_GETARG_INT32(0);
text *relation_and_attr = PG_GETARG_TEXT_P(1);
List *names;
int nnames;
RangeVar *relrv;
char *attribute;
Relation relation_to_scan;
int32 integer_value;
HeapTuple current_tuple;
HeapScanDesc scan_descriptor;
bool isNull,
retval;
int attrid;
Datum value;
/* Parse the argument */
names = textToQualifiedNameList(relation_and_attr, "int4notin");
nnames = length(names);
if (nnames < 2)
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("invalid name syntax"),
errhint("Must provide \"relationname.attributename\".")));
attribute = strVal(nth(nnames - 1, names));
names = ltruncate(nnames - 1, names);
relrv = makeRangeVarFromNameList(names);
/* Open the relation and get a relation descriptor */
relation_to_scan = heap_openrv(relrv, AccessShareLock);
/* Find the column to search */
attrid = attnameAttNum(relation_to_scan, attribute, true);
scan_descriptor = heap_beginscan(relation_to_scan, SnapshotNow,
0, (ScanKey) NULL);
retval = true;
/* do a scan of the relation, and do the check */
while ((current_tuple = heap_getnext(scan_descriptor, ForwardScanDirection)) != NULL)
{
value = heap_getattr(current_tuple,
(AttrNumber) attrid,
RelationGetDescr(relation_to_scan),
&isNull);
if (isNull)
continue;
integer_value = DatumGetInt32(value);
if (not_in_arg == integer_value)
{
retval = false;
break; /* can stop scanning now */
}
}
/* close the relation */
heap_endscan(scan_descriptor);
heap_close(relation_to_scan, AccessShareLock);
PG_RETURN_BOOL(retval);
}
Datum
oidnotin(PG_FUNCTION_ARGS)
{
Oid the_oid = PG_GETARG_OID(0);
#ifdef NOT_USED
text *relation_and_attr = PG_GETARG_TEXT_P(1);
#endif
if (the_oid == InvalidOid)
PG_RETURN_BOOL(false);
/* XXX assume oid maps to int4 */
return int4notin(fcinfo);
}
|
