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For those system catalogs that have a unique indexes, make a primary key and unique constraint, using ALTER TABLE ... PRIMARY KEY/UNIQUE USING INDEX. This can be helpful for GUI tools that look for a primary key, and it might in the future allow declaring foreign keys, for making schema diagrams. The constraint creation statements are automatically created by genbki.pl from DECLARE_UNIQUE_INDEX directives. To specify which one of the available unique indexes is the primary key, use the new directive DECLARE_UNIQUE_INDEX_PKEY instead. By convention, we usually make a catalog's OID column its primary key, if it has one. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://www.postgresql.org/message-id/flat/dc5f44d9-5ec1-a596-0251-dadadcdede98@2ndquadrant.com
75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_amproc.h
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* definition of the "access method procedure" system catalog (pg_amproc)
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*
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* The amproc table identifies support procedures associated with index
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* operator families and classes. These procedures can't be listed in pg_amop
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* since they are not the implementation of any indexable operator.
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*
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* The primary key for this table is <amprocfamily, amproclefttype,
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* amprocrighttype, amprocnum>. The "default" support functions for a
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* particular opclass within the family are those with amproclefttype =
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* amprocrighttype = opclass's opcintype. These are the ones loaded into the
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* relcache for an index and typically used for internal index operations.
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* Other support functions are typically used to handle cross-type indexable
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* operators with oprleft/oprright matching the entry's amproclefttype and
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* amprocrighttype. The exact behavior depends on the index AM, however, and
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* some don't pay attention to non-default functions at all.
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*
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*
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* Portions Copyright (c) 1996-2021, 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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* src/include/catalog/pg_amproc.h
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*
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* NOTES
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* The Catalog.pm module reads this file and derives schema
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* information.
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PG_AMPROC_H
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#define PG_AMPROC_H
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#include "catalog/genbki.h"
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#include "catalog/pg_amproc_d.h"
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/* ----------------
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* pg_amproc definition. cpp turns this into
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* typedef struct FormData_pg_amproc
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* ----------------
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*/
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CATALOG(pg_amproc,2603,AccessMethodProcedureRelationId)
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{
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Oid oid; /* oid */
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/* the index opfamily this entry is for */
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Oid amprocfamily BKI_LOOKUP(pg_opfamily);
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/* procedure's left input data type */
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Oid amproclefttype BKI_LOOKUP(pg_type);
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/* procedure's right input data type */
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Oid amprocrighttype BKI_LOOKUP(pg_type);
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/* support procedure index */
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int16 amprocnum;
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/* OID of the proc */
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regproc amproc BKI_LOOKUP(pg_proc);
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} FormData_pg_amproc;
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/* ----------------
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* Form_pg_amproc corresponds to a pointer to a tuple with
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* the format of pg_amproc relation.
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* ----------------
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*/
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typedef FormData_pg_amproc *Form_pg_amproc;
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DECLARE_UNIQUE_INDEX(pg_amproc_fam_proc_index, 2655, on pg_amproc using btree(amprocfamily oid_ops, amproclefttype oid_ops, amprocrighttype oid_ops, amprocnum int2_ops));
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#define AccessMethodProcedureIndexId 2655
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DECLARE_UNIQUE_INDEX_PKEY(pg_amproc_oid_index, 2757, on pg_amproc using btree(oid oid_ops));
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#define AccessMethodProcedureOidIndexId 2757
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#endif /* PG_AMPROC_H */
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