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Add stratnum GiST support function

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This is support function 12 for the GiST AM and translates
"well-known" RT*StrategyNumber values into whatever strategy number is
used by the opclass (since no particular numbers are actually
required).  We will use this to support temporal PRIMARY
KEY/UNIQUE/FOREIGN KEY/FOR PORTION OF functionality.

This commit adds two implementations, one for internal GiST opclasses
(just an identity function) and another for btree_gist opclasses.  It
updates btree_gist from 1.7 to 1.8, adding the support function for
all its opclasses.

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
2024-01-19 15:41:44 +01:00
parent b725b7eec4
commit 6db4598fcb
17 changed files with 273 additions and 8 deletions
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27
contrib/btree_gist/btree_gist.c
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@ -3,6 +3,7 @@
*/
#include "postgres.h"
#include "access/stratnum.h"
#include "utils/builtins.h"
PG_MODULE_MAGIC;
@ -10,6 +11,7 @@ PG_MODULE_MAGIC;
PG_FUNCTION_INFO_V1(gbt_decompress);
PG_FUNCTION_INFO_V1(gbtreekey_in);
PG_FUNCTION_INFO_V1(gbtreekey_out);
PG_FUNCTION_INFO_V1(gist_stratnum_btree);
/**************************************************
* In/Out for keys
@ -51,3 +53,28 @@ gbt_decompress(PG_FUNCTION_ARGS)
{
PG_RETURN_POINTER(PG_GETARG_POINTER(0));
}
/*
* Returns the btree number for equals, otherwise invalid.
*/
Datum
gist_stratnum_btree(PG_FUNCTION_ARGS)
{
StrategyNumber strat = PG_GETARG_UINT16(0);
switch (strat)
{
case RTEqualStrategyNumber:
PG_RETURN_UINT16(BTEqualStrategyNumber);
case RTLessStrategyNumber:
PG_RETURN_UINT16(BTLessStrategyNumber);
case RTLessEqualStrategyNumber:
PG_RETURN_UINT16(BTLessEqualStrategyNumber);
case RTGreaterStrategyNumber:
PG_RETURN_UINT16(BTGreaterStrategyNumber);
case RTGreaterEqualStrategyNumber:
PG_RETURN_UINT16(BTGreaterEqualStrategyNumber);
default:
PG_RETURN_UINT16(InvalidStrategy);
}
}