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peterepetere
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Add unique index on pg_cast.oid, and document pg_cast table.
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4 files changed

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-15
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4 files changed

+86
-15
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‎doc/src/sgml/catalogs.sgml

Lines changed: 65 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,6 @@
11
<!--
22
Documentation of the system catalogs, directed toward PostgreSQL developers
3-
$Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.45 2002/07/12 18:43:12 tgl Exp $
3+
$Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.46 2002/07/22 20:23:19 petere Exp $
44
-->
55

66
<chapter id="catalogs">
@@ -66,6 +66,11 @@
6666
<entry>table columns (<quote>attributes</quote>, <quote>fields</quote>)</entry>
6767
</row>
6868

69+
<row>
70+
<entry>pg_cast</entry>
71+
<entry>casts (data type conversions)</entry>
72+
</row>
73+
6974
<row>
7075
<entry>pg_class</entry>
7176
<entry>tables, indexes, sequences (<quote>relations</quote>)</entry>
@@ -519,6 +524,65 @@
519524
</sect1>
520525

521526

527+
<sect1 id="catalog-pg-cast">
528+
<title>pg_cast</title>
529+
530+
<para>
531+
<structname>pg_cast</structname> stores data type conversion paths
532+
defined with <command>CREATE CAST</command> plus the built-in
533+
conversions.
534+
</para>
535+
536+
<table>
537+
<title>pg_cast Columns</title>
538+
539+
<tgroup cols=4>
540+
<thead>
541+
<row>
542+
<entry>Name</entry>
543+
<entry>Type</entry>
544+
<entry>References</entry>
545+
<entry>Description</entry>
546+
</row>
547+
</thead>
548+
549+
<tbody>
550+
<row>
551+
<entry>castsource</entry>
552+
<entry><type>oid</type></entry>
553+
<entry>pg_type.oid</entry>
554+
<entry>OID of the source data type</entry>
555+
</row>
556+
557+
<row>
558+
<entry>casttarget</entry>
559+
<entry><type>oid</type></entry>
560+
<entry>pg_type.oid</entry>
561+
<entry>OID of the target data type</entry>
562+
</row>
563+
564+
<row>
565+
<entry>castfunc</entry>
566+
<entry><type>oid</type></entry>
567+
<entry>pg_proc.oid</entry>
568+
<entry>
569+
The OID of the function to use to perform this cast. A 0 is
570+
stored if the data types are binary compatible (that is, no
571+
function is needed to perform the cast).
572+
</entry>
573+
</row>
574+
575+
<row>
576+
<entry>castimplicit</entry>
577+
<entry><type>bool</type></entry>
578+
<entry></entry>
579+
<entry>Indication whether this cast can be invoked implicitly</entry>
580+
</row>
581+
</tbody>
582+
</tgroup>
583+
</table>
584+
</sect1>
585+
522586
<sect1 id="catalog-pg-class">
523587
<title>pg_class</title>
524588

‎src/backend/catalog/indexing.c

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,7 @@
99
*
1010
*
1111
* IDENTIFICATION
12-
* $Header: /cvsroot/pgsql/src/backend/catalog/indexing.c,v 1.98 2002/07/18 23:11:27 petere Exp $
12+
* $Header: /cvsroot/pgsql/src/backend/catalog/indexing.c,v 1.99 2002/07/22 20:23:19 petere Exp $
1313
*
1414
*-------------------------------------------------------------------------
1515
*/
@@ -44,7 +44,7 @@ char *Name_pg_attr_indices[Num_pg_attr_indices] =
4444
char *Name_pg_attrdef_indices[Num_pg_attrdef_indices] =
4545
{AttrDefaultIndex, AttrDefaultOidIndex};
4646
char *Name_pg_cast_indices[Num_pg_cast_indices] =
47-
{CastSourceTargetIndex};
47+
{CastOidIndex, CastSourceTargetIndex};
4848
char *Name_pg_class_indices[Num_pg_class_indices] =
4949
{ClassNameNspIndex, ClassOidIndex};
5050
char *Name_pg_constraint_indices[Num_pg_constraint_indices] =

‎src/backend/commands/functioncmds.c

Lines changed: 15 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,7 @@
99
*
1010
*
1111
* IDENTIFICATION
12-
* $Header: /cvsroot/pgsql/src/backend/commands/functioncmds.c,v 1.11 2002/07/20 05:37:45 momjian Exp $
12+
* $Header: /cvsroot/pgsql/src/backend/commands/functioncmds.c,v 1.12 2002/07/22 20:23:19 petere Exp $
1313
*
1414
* DESCRIPTION
1515
* These routines take the parse tree and pick out the
@@ -31,6 +31,7 @@
3131
*/
3232
#include "postgres.h"
3333

34+
#include "access/genam.h"
3435
#include "access/heapam.h"
3536
#include "catalog/catname.h"
3637
#include "catalog/dependency.h"
@@ -693,7 +694,7 @@ CreateCast(CreateCastStmt *stmt)
693694
if (procstruct->proisagg)
694695
elog(ERROR, "cast function must not be an aggregate function");
695696
if (procstruct->proretset)
696-
elog(ERROR, "cast function must be not return a set");
697+
elog(ERROR, "cast function must not return a set");
697698

698699
ReleaseSysCache(tuple);
699700
}
@@ -727,7 +728,7 @@ CreateCast(CreateCastStmt *stmt)
727728
CatalogCloseIndices(Num_pg_cast_indices, idescs);
728729
}
729730

730-
myself.classId = get_system_catalog_relid(CastRelationName);
731+
myself.classId = RelationGetRelid(relation);
731732
myself.objectId = HeapTupleGetOid(tuple);
732733
myself.objectSubId = 0;
733734

@@ -819,21 +820,25 @@ DropCast(DropCastStmt *stmt)
819820
void
820821
DropCastById(Oid castOid)
821822
{
822-
Relation relation;
823+
Relation relation,
824+
index;
823825
ScanKeyData scankey;
824-
HeapScanDesc scan;
826+
IndexScanDesc scan;
825827
HeapTuple tuple;
826828

827829
relation = heap_openr(CastRelationName, RowExclusiveLock);
830+
index = index_openr(CastOidIndex);
831+
828832
ScanKeyEntryInitialize(&scankey, 0x0,
829-
ObjectIdAttributeNumber, F_OIDEQ,
830-
ObjectIdGetDatum(castOid));
831-
scan = heap_beginscan(relation, SnapshotNow, 1, &scankey);
832-
tuple = heap_getnext(scan, ForwardScanDirection);
833+
1, F_OIDEQ, ObjectIdGetDatum(castOid));
834+
scan = index_beginscan(relation, index, SnapshotNow, 1, &scankey);
835+
tuple = index_getnext(scan, ForwardScanDirection);
833836
if (HeapTupleIsValid(tuple))
834837
simple_heap_delete(relation, &tuple->t_self);
835838
else
836839
elog(ERROR, "could not find tuple for cast %u", castOid);
837-
heap_endscan(scan);
840+
index_endscan(scan);
841+
842+
index_close(index);
838843
heap_close(relation, RowExclusiveLock);
839844
}

‎src/include/catalog/indexing.h

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
99
* Portions Copyright (c) 1994, Regents of the University of California
1010
*
11-
* $Id: indexing.h,v 1.71 2002/07/18 23:11:30 petere Exp $
11+
* $Id: indexing.h,v 1.72 2002/07/22 20:23:19 petere Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -26,7 +26,7 @@
2626
#define Num_pg_amproc_indices 1
2727
#define Num_pg_attr_indices 2
2828
#define Num_pg_attrdef_indices 2
29-
#define Num_pg_cast_indices 1
29+
#define Num_pg_cast_indices 2
3030
#define Num_pg_class_indices 2
3131
#define Num_pg_constraint_indices 3
3232
#define Num_pg_conversion_indices 3
@@ -61,6 +61,7 @@
6161
#define AttrDefaultOidIndex "pg_attrdef_oid_index"
6262
#define AttributeRelidNameIndex "pg_attribute_relid_attnam_index"
6363
#define AttributeRelidNumIndex "pg_attribute_relid_attnum_index"
64+
#define CastOidIndex "pg_cast_oid_index"
6465
#define CastSourceTargetIndex "pg_cast_source_target_index"
6566
#define ClassNameNspIndex "pg_class_relname_nsp_index"
6667
#define ClassOidIndex "pg_class_oid_index"
@@ -169,6 +170,7 @@ DECLARE_UNIQUE_INDEX(pg_attrdef_adrelid_adnum_index on pg_attrdef using btree(ad
169170
DECLARE_UNIQUE_INDEX(pg_attrdef_oid_index on pg_attrdef using btree(oid oid_ops));
170171
DECLARE_UNIQUE_INDEX(pg_attribute_relid_attnam_index on pg_attribute using btree(attrelid oid_ops, attname name_ops));
171172
DECLARE_UNIQUE_INDEX(pg_attribute_relid_attnum_index on pg_attribute using btree(attrelid oid_ops, attnum int2_ops));
173+
DECLARE_UNIQUE_INDEX(pg_cast_oid_index on pg_cast using btree(oid oid_ops));
172174
DECLARE_UNIQUE_INDEX(pg_cast_source_target_index on pg_cast using btree(castsource oid_ops, casttarget oid_ops));
173175
DECLARE_UNIQUE_INDEX(pg_class_oid_index on pg_class using btree(oid oid_ops));
174176
DECLARE_UNIQUE_INDEX(pg_class_relname_nsp_index on pg_class using btree(relname name_ops, relnamespace oid_ops));

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