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/*
* contrib/btree_gist/btree_gist.c
*/
#include "postgres.h"
#include "access/stratnum.h"
#include "utils/builtins.h"
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
**************************************************/
Datum
gbtreekey_in(PG_FUNCTION_ARGS)
{
Oid typioparam = PG_GETARG_OID(1);
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot accept a value of type %s",
format_type_extended(typioparam, -1,
FORMAT_TYPE_ALLOW_INVALID))));
PG_RETURN_VOID(); /* keep compiler quiet */
}
Datum
gbtreekey_out(PG_FUNCTION_ARGS)
{
/* Sadly, we do not receive any indication of the specific type */
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("cannot display a value of type %s", "gbtreekey?")));
PG_RETURN_VOID(); /* keep compiler quiet */
}
/*
** GiST DeCompress methods
** do not do anything.
*/
Datum
gbt_decompress(PG_FUNCTION_ARGS)
{
PG_RETURN_POINTER(PG_GETARG_POINTER(0));
}
/*
* Returns the btree number for supported operators, 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);
}
}
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