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/*
* contrib/btree_gist/btree_bit.c
*/
#include "postgres.h"
#include "btree_gist.h"
#include "btree_utils_var.h"
#include "utils/fmgrprotos.h"
#include "utils/sortsupport.h"
#include "utils/varbit.h"
/* GiST support functions */
PG_FUNCTION_INFO_V1(gbt_bit_compress);
PG_FUNCTION_INFO_V1(gbt_bit_union);
PG_FUNCTION_INFO_V1(gbt_bit_picksplit);
PG_FUNCTION_INFO_V1(gbt_bit_consistent);
PG_FUNCTION_INFO_V1(gbt_bit_penalty);
PG_FUNCTION_INFO_V1(gbt_bit_same);
PG_FUNCTION_INFO_V1(gbt_bit_sortsupport);
PG_FUNCTION_INFO_V1(gbt_varbit_sortsupport);
/* define for comparison */
static bool
gbt_bitgt(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
return DatumGetBool(DirectFunctionCall2(bitgt,
PointerGetDatum(a),
PointerGetDatum(b)));
}
static bool
gbt_bitge(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
return DatumGetBool(DirectFunctionCall2(bitge,
PointerGetDatum(a),
PointerGetDatum(b)));
}
static bool
gbt_biteq(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
return DatumGetBool(DirectFunctionCall2(biteq,
PointerGetDatum(a),
PointerGetDatum(b)));
}
static bool
gbt_bitle(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
return DatumGetBool(DirectFunctionCall2(bitle,
PointerGetDatum(a),
PointerGetDatum(b)));
}
static bool
gbt_bitlt(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
return DatumGetBool(DirectFunctionCall2(bitlt,
PointerGetDatum(a),
PointerGetDatum(b)));
}
static int32
gbt_bitcmp(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
return DatumGetInt32(DirectFunctionCall2(byteacmp,
PointerGetDatum(a),
PointerGetDatum(b)));
}
static bytea *
gbt_bit_xfrm(bytea *leaf)
{
bytea *out = leaf;
int sz = VARBITBYTES(leaf) + VARHDRSZ;
int padded_sz = INTALIGN(sz);
out = (bytea *) palloc(padded_sz);
/* initialize the padding bytes to zero */
while (sz < padded_sz)
((char *) out)[sz++] = 0;
SET_VARSIZE(out, padded_sz);
memcpy(VARDATA(out), VARBITS(leaf), VARBITBYTES(leaf));
return out;
}
static GBT_VARKEY *
gbt_bit_l2n(GBT_VARKEY *leaf, FmgrInfo *flinfo)
{
GBT_VARKEY *out = leaf;
GBT_VARKEY_R r = gbt_var_key_readable(leaf);
bytea *o;
o = gbt_bit_xfrm(r.lower);
r.upper = r.lower = o;
out = gbt_var_key_copy(&r);
pfree(o);
return out;
}
static const gbtree_vinfo tinfo =
{
gbt_t_bit,
0,
true,
gbt_bitgt,
gbt_bitge,
gbt_biteq,
gbt_bitle,
gbt_bitlt,
gbt_bitcmp,
gbt_bit_l2n
};
/**************************************************
* GiST support functions
**************************************************/
Datum
gbt_bit_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
PG_RETURN_POINTER(gbt_var_compress(entry, &tinfo));
}
Datum
gbt_bit_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
void *query = DatumGetByteaP(PG_GETARG_DATUM(1));
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
/* Oid subtype = PG_GETARG_OID(3); */
bool *recheck = (bool *) PG_GETARG_POINTER(4);
bool retval;
GBT_VARKEY *key = (GBT_VARKEY *) DatumGetPointer(entry->key);
GBT_VARKEY_R r = gbt_var_key_readable(key);
/* All cases served by this function are exact */
*recheck = false;
if (GIST_LEAF(entry))
retval = gbt_var_consistent(&r, query, strategy, PG_GET_COLLATION(),
true, &tinfo, fcinfo->flinfo);
else
{
bytea *q = gbt_bit_xfrm((bytea *) query);
retval = gbt_var_consistent(&r, q, strategy, PG_GET_COLLATION(),
false, &tinfo, fcinfo->flinfo);
}
PG_RETURN_BOOL(retval);
}
Datum
gbt_bit_union(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
int32 *size = (int *) PG_GETARG_POINTER(1);
PG_RETURN_POINTER(gbt_var_union(entryvec, size, PG_GET_COLLATION(),
&tinfo, fcinfo->flinfo));
}
Datum
gbt_bit_picksplit(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
gbt_var_picksplit(entryvec, v, PG_GET_COLLATION(),
&tinfo, fcinfo->flinfo);
PG_RETURN_POINTER(v);
}
Datum
gbt_bit_same(PG_FUNCTION_ARGS)
{
Datum d1 = PG_GETARG_DATUM(0);
Datum d2 = PG_GETARG_DATUM(1);
bool *result = (bool *) PG_GETARG_POINTER(2);
*result = gbt_var_same(d1, d2, PG_GET_COLLATION(), &tinfo, fcinfo->flinfo);
PG_RETURN_POINTER(result);
}
Datum
gbt_bit_penalty(PG_FUNCTION_ARGS)
{
GISTENTRY *o = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *n = (GISTENTRY *) PG_GETARG_POINTER(1);
float *result = (float *) PG_GETARG_POINTER(2);
PG_RETURN_POINTER(gbt_var_penalty(result, o, n, PG_GET_COLLATION(),
&tinfo, fcinfo->flinfo));
}
static int
gbt_bit_ssup_cmp(Datum x, Datum y, SortSupport ssup)
{
GBT_VARKEY *key1 = PG_DETOAST_DATUM(x);
GBT_VARKEY *key2 = PG_DETOAST_DATUM(y);
GBT_VARKEY_R arg1 = gbt_var_key_readable(key1);
GBT_VARKEY_R arg2 = gbt_var_key_readable(key2);
Datum result;
/* for leaf items we expect lower == upper, so only compare lower */
result = DirectFunctionCall2(byteacmp,
PointerGetDatum(arg1.lower),
PointerGetDatum(arg2.lower));
GBT_FREE_IF_COPY(key1, x);
GBT_FREE_IF_COPY(key2, y);
return DatumGetInt32(result);
}
Datum
gbt_bit_sortsupport(PG_FUNCTION_ARGS)
{
SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
ssup->comparator = gbt_bit_ssup_cmp;
ssup->ssup_extra = NULL;
PG_RETURN_VOID();
}
Datum
gbt_varbit_sortsupport(PG_FUNCTION_ARGS)
{
SortSupport ssup = (SortSupport) PG_GETARG_POINTER(0);
ssup->comparator = gbt_bit_ssup_cmp;
ssup->ssup_extra = NULL;
PG_RETURN_VOID();
}
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