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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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29
src/backend/access/gist/gistutil.c
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@ -1070,3 +1070,32 @@ gist_stratnum_identity(PG_FUNCTION_ARGS)
PG_RETURN_UINT16(strat);
}
/*
* Returns the opclass's private stratnum used for the given strategy.
*
* Calls the opclass's GIST_STRATNUM_PROC support function, if any,
* and returns the result.
* Returns InvalidStrategy if the function is not defined.
*/
StrategyNumber
GistTranslateStratnum(Oid opclass, StrategyNumber strat)
{
Oid opfamily;
Oid opcintype;
Oid funcid;
Datum result;
/* Look up the opclass family and input datatype. */
if (!get_opclass_opfamily_and_input_type(opclass, &opfamily, &opcintype))
return InvalidStrategy;
/* Check whether the function is provided. */
funcid = get_opfamily_proc(opfamily, opcintype, opcintype, GIST_STRATNUM_PROC);
if (!OidIsValid(funcid))
return InvalidStrategy;
/* Ask the translation function */
result = OidFunctionCall1Coll(funcid, InvalidOid, UInt16GetDatum(strat));
return DatumGetUInt16(result);
}