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Implement IF NOT EXISTS for CREATE SEQUENCE.

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Fabrízio de Royes Mello
This commit is contained in:
Heikki Linnakangas
2014-08-26 16:05:18 +03:00
parent 57ca1d4f01
commit 0076f264b6
8 changed files with 49 additions and 2 deletions
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20
src/backend/commands/sequence.c
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@ -122,6 +122,24 @@ DefineSequence(CreateSeqStmt *seq)
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("unlogged sequences are not supported")));
/*
* If if_not_exists was given and a relation with the same name already
* exists, bail out. (Note: we needn't check this when not if_not_exists,
* because DefineRelation will complain anyway.)
*/
if (seq->if_not_exists)
{
RangeVarGetAndCheckCreationNamespace(seq->sequence, NoLock, &seqoid);
if (OidIsValid(seqoid))
{
ereport(NOTICE,
(errcode(ERRCODE_DUPLICATE_TABLE),
errmsg("relation \"%s\" already exists, skipping",
seq->sequence->relname)));
return InvalidOid;
}
}
/* Check and set all option values */
init_params(seq->options, true, &new, &owned_by);
@ -210,7 +228,7 @@ DefineSequence(CreateSeqStmt *seq)
stmt->options = NIL;
stmt->oncommit = ONCOMMIT_NOOP;
stmt->tablespacename = NULL;
stmt->if_not_exists = false;
stmt->if_not_exists = seq->if_not_exists;
seqoid = DefineRelation(stmt, RELKIND_SEQUENCE, seq->ownerId);
Assert(seqoid != InvalidOid);