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630f9a43ce
This changes commit 7406ab623fe in that the gist strategy number mapping support function is changed to use the CompareType enum as input, instead of the "well-known" RT*StrategyNumber strategy numbers. This is a bit cleaner, since you are not dealing with two sets of strategy numbers. Also, this will enable us to subsume this system into a more general system of using CompareType to define operator semantics across index methods. Discussion: https://www.postgresql.org/message-id/flat/E72EAA49-354D-4C2E-8EB9-255197F55330@enterprisedb.com
82 lines
1.7 KiB
C
82 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 "nodes/primnodes.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 supported operators, 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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CompareType cmptype = PG_GETARG_INT32(0);
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switch (cmptype)
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{
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case COMPARE_EQ:
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PG_RETURN_UINT16(BTEqualStrategyNumber);
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case COMPARE_LT:
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PG_RETURN_UINT16(BTLessStrategyNumber);
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case COMPARE_LE:
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PG_RETURN_UINT16(BTLessEqualStrategyNumber);
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case COMPARE_GT:
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PG_RETURN_UINT16(BTGreaterStrategyNumber);
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case COMPARE_GE:
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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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