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Add temporal PRIMARY KEY and UNIQUE constraints

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Add WITHOUT OVERLAPS clause to PRIMARY KEY and UNIQUE constraints.
These are backed by GiST indexes instead of B-tree indexes, since they
are essentially exclusion constraints with = for the scalar parts of
the key and && for the temporal part.

Author: Paul A. Jungwirth <pj@illuminatedcomputing.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: jian he <jian.universality@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CA+renyUApHgSZF9-nd-a0+OPGharLQLO=mDHcY4_qQ0+noCUVg@mail.gmail.com
This commit is contained in:
Peter Eisentraut
2024-01-24 15:43:41 +01:00
parent 74a7306310
commit 46a0cd4cef
34 changed files with 1135 additions and 52 deletions
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18
src/backend/utils/cache/relcache.c vendored
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@@ -5568,11 +5568,14 @@ RelationGetIdentityKeyBitmap(Relation relation)
/*
* RelationGetExclusionInfo -- get info about index's exclusion constraint
*
* This should be called only for an index that is known to have an
* associated exclusion constraint. It returns arrays (palloc'd in caller's
* context) of the exclusion operator OIDs, their underlying functions'
* OIDs, and their strategy numbers in the index's opclasses. We cache
* all this information since it requires a fair amount of work to get.
* This should be called only for an index that is known to have an associated
* exclusion constraint or primary key/unique constraint using WITHOUT
* OVERLAPS.
* It returns arrays (palloc'd in caller's context) of the exclusion operator
* OIDs, their underlying functions' OIDs, and their strategy numbers in the
* index's opclasses. We cache all this information since it requires a fair
* amount of work to get.
*/
void
RelationGetExclusionInfo(Relation indexRelation,
@@ -5636,7 +5639,10 @@ RelationGetExclusionInfo(Relation indexRelation,
int nelem;
/* We want the exclusion constraint owning the index */
if (conform->contype != CONSTRAINT_EXCLUSION ||
if ((conform->contype != CONSTRAINT_EXCLUSION &&
!(conform->conwithoutoverlaps && (
conform->contype == CONSTRAINT_PRIMARY
|| conform->contype == CONSTRAINT_UNIQUE))) ||
conform->conindid != RelationGetRelid(indexRelation))
continue;