Add unique index on pg_cast.oid, and document pg_cast table.
This commit is contained in:
Peter Eisentraut
parent
a7ffd69d4c
commit
e9c013f4bd
@ -1,6 +1,6 @@
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<!--
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Documentation of the system catalogs, directed toward PostgreSQL developers
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$Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.45 2002/07/12 18:43:12 tgl Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.46 2002/07/22 20:23:19 petere Exp $
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-->
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<chapter id="catalogs">
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@ -66,6 +66,11 @@
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<entry>table columns (<quote>attributes</quote>, <quote>fields</quote>)</entry>
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</row>
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<row>
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<entry>pg_cast</entry>
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<entry>casts (data type conversions)</entry>
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</row>
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<row>
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<entry>pg_class</entry>
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<entry>tables, indexes, sequences (<quote>relations</quote>)</entry>
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@ -519,6 +524,65 @@
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</sect1>
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<sect1 id="catalog-pg-cast">
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<title>pg_cast</title>
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<para>
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<structname>pg_cast</structname> stores data type conversion paths
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defined with <command>CREATE CAST</command> plus the built-in
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conversions.
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</para>
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<table>
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<title>pg_cast Columns</title>
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<tgroup cols=4>
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Type</entry>
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<entry>References</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>castsource</entry>
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<entry><type>oid</type></entry>
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<entry>pg_type.oid</entry>
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<entry>OID of the source data type</entry>
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</row>
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<row>
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<entry>casttarget</entry>
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<entry><type>oid</type></entry>
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<entry>pg_type.oid</entry>
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<entry>OID of the target data type</entry>
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</row>
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<row>
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<entry>castfunc</entry>
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<entry><type>oid</type></entry>
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<entry>pg_proc.oid</entry>
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<entry>
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The OID of the function to use to perform this cast. A 0 is
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stored if the data types are binary compatible (that is, no
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function is needed to perform the cast).
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</entry>
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</row>
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<row>
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<entry>castimplicit</entry>
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<entry><type>bool</type></entry>
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<entry></entry>
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<entry>Indication whether this cast can be invoked implicitly</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</sect1>
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<sect1 id="catalog-pg-class">
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<title>pg_class</title>
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@ -9,7 +9,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/catalog/indexing.c,v 1.98 2002/07/18 23:11:27 petere Exp $
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* $Header: /cvsroot/pgsql/src/backend/catalog/indexing.c,v 1.99 2002/07/22 20:23:19 petere Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -44,7 +44,7 @@ char *Name_pg_attr_indices[Num_pg_attr_indices] =
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char *Name_pg_attrdef_indices[Num_pg_attrdef_indices] =
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{AttrDefaultIndex, AttrDefaultOidIndex};
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char *Name_pg_cast_indices[Num_pg_cast_indices] =
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{CastSourceTargetIndex};
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{CastOidIndex, CastSourceTargetIndex};
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char *Name_pg_class_indices[Num_pg_class_indices] =
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{ClassNameNspIndex, ClassOidIndex};
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char *Name_pg_constraint_indices[Num_pg_constraint_indices] =
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@ -9,7 +9,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/commands/functioncmds.c,v 1.11 2002/07/20 05:37:45 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/commands/functioncmds.c,v 1.12 2002/07/22 20:23:19 petere Exp $
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*
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* DESCRIPTION
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* These routines take the parse tree and pick out the
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@ -31,6 +31,7 @@
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*/
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#include "postgres.h"
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#include "access/genam.h"
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#include "access/heapam.h"
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#include "catalog/catname.h"
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#include "catalog/dependency.h"
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@ -693,7 +694,7 @@ CreateCast(CreateCastStmt *stmt)
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if (procstruct->proisagg)
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elog(ERROR, "cast function must not be an aggregate function");
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if (procstruct->proretset)
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elog(ERROR, "cast function must be not return a set");
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elog(ERROR, "cast function must not return a set");
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ReleaseSysCache(tuple);
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}
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@ -727,7 +728,7 @@ CreateCast(CreateCastStmt *stmt)
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CatalogCloseIndices(Num_pg_cast_indices, idescs);
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}
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myself.classId = get_system_catalog_relid(CastRelationName);
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myself.classId = RelationGetRelid(relation);
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myself.objectId = HeapTupleGetOid(tuple);
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myself.objectSubId = 0;
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@ -819,21 +820,25 @@ DropCast(DropCastStmt *stmt)
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void
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DropCastById(Oid castOid)
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{
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Relation relation;
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Relation relation,
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index;
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ScanKeyData scankey;
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HeapScanDesc scan;
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IndexScanDesc scan;
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HeapTuple tuple;
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relation = heap_openr(CastRelationName, RowExclusiveLock);
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index = index_openr(CastOidIndex);
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ScanKeyEntryInitialize(&scankey, 0x0,
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ObjectIdAttributeNumber, F_OIDEQ,
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ObjectIdGetDatum(castOid));
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scan = heap_beginscan(relation, SnapshotNow, 1, &scankey);
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tuple = heap_getnext(scan, ForwardScanDirection);
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1, F_OIDEQ, ObjectIdGetDatum(castOid));
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scan = index_beginscan(relation, index, SnapshotNow, 1, &scankey);
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tuple = index_getnext(scan, ForwardScanDirection);
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if (HeapTupleIsValid(tuple))
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simple_heap_delete(relation, &tuple->t_self);
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else
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elog(ERROR, "could not find tuple for cast %u", castOid);
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heap_endscan(scan);
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index_endscan(scan);
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index_close(index);
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heap_close(relation, RowExclusiveLock);
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}
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@ -8,7 +8,7 @@
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* Portions Copyright (c) 1996-2002, 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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* $Id: indexing.h,v 1.71 2002/07/18 23:11:30 petere Exp $
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* $Id: indexing.h,v 1.72 2002/07/22 20:23:19 petere Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -26,7 +26,7 @@
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#define Num_pg_amproc_indices 1
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#define Num_pg_attr_indices 2
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#define Num_pg_attrdef_indices 2
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#define Num_pg_cast_indices 1
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#define Num_pg_cast_indices 2
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#define Num_pg_class_indices 2
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#define Num_pg_constraint_indices 3
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#define Num_pg_conversion_indices 3
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@ -61,6 +61,7 @@
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#define AttrDefaultOidIndex "pg_attrdef_oid_index"
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#define AttributeRelidNameIndex "pg_attribute_relid_attnam_index"
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#define AttributeRelidNumIndex "pg_attribute_relid_attnum_index"
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#define CastOidIndex "pg_cast_oid_index"
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#define CastSourceTargetIndex "pg_cast_source_target_index"
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#define ClassNameNspIndex "pg_class_relname_nsp_index"
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#define ClassOidIndex "pg_class_oid_index"
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@ -169,6 +170,7 @@ DECLARE_UNIQUE_INDEX(pg_attrdef_adrelid_adnum_index on pg_attrdef using btree(ad
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DECLARE_UNIQUE_INDEX(pg_attrdef_oid_index on pg_attrdef using btree(oid oid_ops));
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DECLARE_UNIQUE_INDEX(pg_attribute_relid_attnam_index on pg_attribute using btree(attrelid oid_ops, attname name_ops));
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DECLARE_UNIQUE_INDEX(pg_attribute_relid_attnum_index on pg_attribute using btree(attrelid oid_ops, attnum int2_ops));
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DECLARE_UNIQUE_INDEX(pg_cast_oid_index on pg_cast using btree(oid oid_ops));
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DECLARE_UNIQUE_INDEX(pg_cast_source_target_index on pg_cast using btree(castsource oid_ops, casttarget oid_ops));
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DECLARE_UNIQUE_INDEX(pg_class_oid_index on pg_class using btree(oid oid_ops));
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DECLARE_UNIQUE_INDEX(pg_class_relname_nsp_index on pg_class using btree(relname name_ops, relnamespace oid_ops));
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