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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
81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
/*
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* contrib/btree_gist/btree_gist.c
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*/
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#include "postgres.h"
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#include "access/stratnum.h"
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#include "utils/builtins.h"
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PG_MODULE_MAGIC;
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PG_FUNCTION_INFO_V1(gbt_decompress);
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PG_FUNCTION_INFO_V1(gbtreekey_in);
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PG_FUNCTION_INFO_V1(gbtreekey_out);
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PG_FUNCTION_INFO_V1(gist_stratnum_btree);
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/**************************************************
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* In/Out for keys
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**************************************************/
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Datum
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gbtreekey_in(PG_FUNCTION_ARGS)
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{
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Oid typioparam = PG_GETARG_OID(1);
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot accept a value of type %s",
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format_type_extended(typioparam, -1,
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FORMAT_TYPE_ALLOW_INVALID))));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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Datum
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gbtreekey_out(PG_FUNCTION_ARGS)
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{
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/* Sadly, we do not receive any indication of the specific type */
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot display a value of type %s", "gbtreekey?")));
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PG_RETURN_VOID(); /* keep compiler quiet */
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}
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/*
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** GiST DeCompress methods
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** do not do anything.
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*/
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Datum
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gbt_decompress(PG_FUNCTION_ARGS)
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{
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PG_RETURN_POINTER(PG_GETARG_POINTER(0));
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}
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/*
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* Returns the btree number for equals, otherwise invalid.
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*/
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Datum
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gist_stratnum_btree(PG_FUNCTION_ARGS)
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{
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StrategyNumber strat = PG_GETARG_UINT16(0);
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switch (strat)
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{
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case RTEqualStrategyNumber:
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PG_RETURN_UINT16(BTEqualStrategyNumber);
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case RTLessStrategyNumber:
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PG_RETURN_UINT16(BTLessStrategyNumber);
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case RTLessEqualStrategyNumber:
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PG_RETURN_UINT16(BTLessEqualStrategyNumber);
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case RTGreaterStrategyNumber:
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PG_RETURN_UINT16(BTGreaterStrategyNumber);
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case RTGreaterEqualStrategyNumber:
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PG_RETURN_UINT16(BTGreaterEqualStrategyNumber);
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default:
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PG_RETURN_UINT16(InvalidStrategy);
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}
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}
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