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/*-------------------------------------------------------------------------
*
* tsginidx.c
* GIN support functions for tsvector_ops
*
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/tsginidx.c,v 1.15 2009/03/25 22:19:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/skey.h"
#include "tsearch/ts_type.h"
#include "tsearch/ts_utils.h"
#include "utils/builtins.h"
Datum
gin_cmp_tslexeme(PG_FUNCTION_ARGS)
{
text *a = PG_GETARG_TEXT_PP(0);
text *b = PG_GETARG_TEXT_PP(1);
int cmp;
cmp = tsCompareString(
VARDATA_ANY(a), VARSIZE_ANY_EXHDR(a),
VARDATA_ANY(b), VARSIZE_ANY_EXHDR(b),
false );
PG_FREE_IF_COPY(a,0);
PG_FREE_IF_COPY(b,1);
PG_RETURN_INT32( cmp );
}
Datum
gin_cmp_prefix(PG_FUNCTION_ARGS)
{
text *a = PG_GETARG_TEXT_PP(0);
text *b = PG_GETARG_TEXT_PP(1);
#ifdef NOT_USED
StrategyNumber strategy = PG_GETARG_UINT16(2);
Pointer extra_data = PG_GETARG_POINTER(3);
#endif
int cmp;
cmp = tsCompareString(
VARDATA_ANY(a), VARSIZE_ANY_EXHDR(a),
VARDATA_ANY(b), VARSIZE_ANY_EXHDR(b),
true );
if ( cmp < 0 )
cmp = 1; /* prevent continue scan */
PG_FREE_IF_COPY(a,0);
PG_FREE_IF_COPY(b,1);
PG_RETURN_INT32( cmp );
}
Datum
gin_extract_tsvector(PG_FUNCTION_ARGS)
{
TSVector vector = PG_GETARG_TSVECTOR(0);
int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
Datum *entries = NULL;
*nentries = vector->size;
if (vector->size > 0)
{
int i;
WordEntry *we = ARRPTR(vector);
entries = (Datum *) palloc(sizeof(Datum) * vector->size);
for (i = 0; i < vector->size; i++)
{
text *txt;
txt = cstring_to_text_with_len(STRPTR(vector) + we->pos, we->len);
entries[i] = PointerGetDatum(txt);
we++;
}
}
PG_FREE_IF_COPY(vector, 0);
PG_RETURN_POINTER(entries);
}
Datum
gin_extract_tsquery(PG_FUNCTION_ARGS)
{
TSQuery query = PG_GETARG_TSQUERY(0);
int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
/* StrategyNumber strategy = PG_GETARG_UINT16(2); */
bool **ptr_partialmatch = (bool**) PG_GETARG_POINTER(3);
Pointer **extra_data = (Pointer **) PG_GETARG_POINTER(4);
Datum *entries = NULL;
bool *partialmatch;
*nentries = 0;
if (query->size > 0)
{
int4 i,
j = 0,
len;
QueryItem *item;
bool use_fullscan=false;
int *map_item_operand;
item = clean_NOT(GETQUERY(query), &len);
if (!item)
{
use_fullscan = true;
*nentries = 1;
}
item = GETQUERY(query);
for (i = 0; i < query->size; i++)
if (item[i].type == QI_VAL)
(*nentries)++;
entries = (Datum *) palloc(sizeof(Datum) * (*nentries));
partialmatch = *ptr_partialmatch = (bool*) palloc(sizeof(bool) * (*nentries));
/*
* Make map to convert item's number to corresponding
* operand's (the same, entry's) number. Entry's number
* is used in check array in consistent method. We use
* the same map for each entry.
*/
*extra_data = (Pointer*) palloc0(sizeof(Pointer)*(*nentries));
map_item_operand = palloc0(sizeof(int) * (query->size + 1));
for (i = 0; i < query->size; i++)
if (item[i].type == QI_VAL)
{
text *txt;
QueryOperand *val = &item[i].operand;
txt = cstring_to_text_with_len(GETOPERAND(query) + val->distance,
val->length);
(*extra_data)[j] = (Pointer)map_item_operand;
map_item_operand[i] = j;
partialmatch[j] = val->prefix;
entries[j++] = PointerGetDatum(txt);
}
if ( use_fullscan )
{
(*extra_data)[j] = (Pointer)map_item_operand;
map_item_operand[i] = j;
entries[j++] = PointerGetDatum(cstring_to_text_with_len("", 0));
}
}
else
*nentries = -1; /* nothing can be found */
PG_FREE_IF_COPY(query, 0);
PG_RETURN_POINTER(entries);
}
typedef struct
{
QueryItem *first_item;
bool *check;
int *map_item_operand;
bool *need_recheck;
} GinChkVal;
static bool
checkcondition_gin(void *checkval, QueryOperand *val)
{
GinChkVal *gcv = (GinChkVal *) checkval;
int j;
/* if any val requiring a weight is used, set recheck flag */
if (val->weight != 0)
*(gcv->need_recheck) = true;
/* convert item's number to corresponding entry's (operand's) number */
j = gcv->map_item_operand[ ((QueryItem *) val) - gcv->first_item ];
/* return presence of current entry in indexed value */
return gcv->check[j];
}
Datum
gin_tsquery_consistent(PG_FUNCTION_ARGS)
{
bool *check = (bool *) PG_GETARG_POINTER(0);
/* StrategyNumber strategy = PG_GETARG_UINT16(1); */
TSQuery query = PG_GETARG_TSQUERY(2);
/* int32 nkeys = PG_GETARG_INT32(3); */
Pointer *extra_data = (Pointer *) PG_GETARG_POINTER(4);
bool *recheck = (bool *) PG_GETARG_POINTER(5);
bool res = FALSE;
/* The query requires recheck only if it involves weights */
*recheck = false;
if (query->size > 0)
{
QueryItem *item;
GinChkVal gcv;
/*
* check-parameter array has one entry for each value (operand) in the
* query.
*/
gcv.first_item = item = GETQUERY(query);
gcv.check = check;
gcv.map_item_operand = (int*)(extra_data[0]);
gcv.need_recheck = recheck;
res = TS_execute(
GETQUERY(query),
&gcv,
true,
checkcondition_gin
);
}
PG_RETURN_BOOL(res);
}
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