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Introduce sequence_*() access functions

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Similarly to tables and indexes, these functions are able to open
relations with a sequence relkind, which is useful to make a distinction
with the other relation kinds.  Previously, commands/sequence.c used a
mix of table_{close,open}() and relation_{close,open}() routines when
manipulating sequence relations, so this clarifies the code.

A direct effect of this change is to align the error messages produced
when attempting DDLs for sequences on relations with an unexpected
relkind, like a table or an index with ALTER SEQUENCE, providing an
extra error detail about the relkind of the relation used in the DDL
query.

Author: Michael Paquier
Reviewed-by: Tomas Vondra
Discussion: https://postgr.es/m/ZWlohtKAs0uVVpZ3@paquier.xyz
This commit is contained in:
Michael Paquier
2024-02-26 16:04:59 +09:00
parent 025f0a6f91
commit 449e798c77
8 changed files with 140 additions and 20 deletions
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23
src/include/access/sequence.h Normal file
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/*-------------------------------------------------------------------------
*
* sequence.h
* Generic routines for sequence-related code.
*
*
* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/sequence.h
*
*-------------------------------------------------------------------------
*/
#ifndef ACCESS_SEQUENCE_H
#define ACCESS_SEQUENCE_H
#include "storage/lockdefs.h"
#include "utils/relcache.h"
extern Relation sequence_open(Oid relationId, LOCKMODE lockmode);
extern void sequence_close(Relation relation, LOCKMODE lockmode);
#endif /* ACCESS_SEQUENCE_H */