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d4c6da1527
In this case extractQuery should returns -1 as nentries. This changes prototype of extractQuery method to use int32* instead of uint32* for nentries argument. Based on that gincostestimate may see two corner cases: nothing will be found or seqscan should be used. Per proposal at http://archives.postgresql.org/pgsql-hackers/2007-01/msg01581.php PS tsearch_core patch should be sightly modified to support changes, but I'm waiting a verdict about reviewing of tsearch_core patch.
160 lines
3.3 KiB
C
160 lines
3.3 KiB
C
#include "postgres.h"
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#include <float.h>
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#include "access/gist.h"
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#include "access/itup.h"
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#include "access/skey.h"
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#include "access/tuptoaster.h"
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#include "storage/bufpage.h"
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#include "utils/array.h"
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#include "utils/builtins.h"
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#include "tsvector.h"
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#include "query.h"
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#include "query_cleanup.h"
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PG_FUNCTION_INFO_V1(gin_extract_tsvector);
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Datum gin_extract_tsvector(PG_FUNCTION_ARGS);
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Datum
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gin_extract_tsvector(PG_FUNCTION_ARGS)
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{
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tsvector *vector = (tsvector *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
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Datum *entries = NULL;
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*nentries = 0;
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if (vector->size > 0)
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{
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int i;
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WordEntry *we = ARRPTR(vector);
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*nentries = (int32) vector->size;
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entries = (Datum *) palloc(sizeof(Datum) * vector->size);
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for (i = 0; i < vector->size; i++)
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{
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text *txt = (text *) palloc(VARHDRSZ + we->len);
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VARATT_SIZEP(txt) = VARHDRSZ + we->len;
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memcpy(VARDATA(txt), STRPTR(vector) + we->pos, we->len);
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entries[i] = PointerGetDatum(txt);
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we++;
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}
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}
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PG_FREE_IF_COPY(vector, 0);
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PG_RETURN_POINTER(entries);
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}
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PG_FUNCTION_INFO_V1(gin_extract_tsquery);
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Datum gin_extract_tsquery(PG_FUNCTION_ARGS);
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Datum
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gin_extract_tsquery(PG_FUNCTION_ARGS)
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{
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QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
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StrategyNumber strategy = DatumGetUInt16(PG_GETARG_DATUM(2));
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Datum *entries = NULL;
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*nentries = 0;
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if (query->size > 0)
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{
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int4 i,
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j = 0,
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len;
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ITEM *item;
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item = clean_NOT_v2(GETQUERY(query), &len);
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if (!item)
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elog(ERROR, "Query requires full scan, GIN doesn't support it");
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item = GETQUERY(query);
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for (i = 0; i < query->size; i++)
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if (item[i].type == VAL)
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(*nentries)++;
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entries = (Datum *) palloc(sizeof(Datum) * (*nentries));
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for (i = 0; i < query->size; i++)
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if (item[i].type == VAL)
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{
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text *txt;
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txt = (text *) palloc(VARHDRSZ + item[i].length);
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VARATT_SIZEP(txt) = VARHDRSZ + item[i].length;
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memcpy(VARDATA(txt), GETOPERAND(query) + item[i].distance, item[i].length);
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entries[j++] = PointerGetDatum(txt);
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if (strategy == 1 && item[i].weight != 0)
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elog(ERROR, "With class of lexeme restrictions use @@@ operation");
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}
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}
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else
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*nentries = -1; /* nothing can be found */
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PG_FREE_IF_COPY(query, 0);
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PG_RETURN_POINTER(entries);
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}
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typedef struct
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{
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ITEM *frst;
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bool *mapped_check;
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} GinChkVal;
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static bool
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checkcondition_gin(void *checkval, ITEM * val)
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{
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GinChkVal *gcv = (GinChkVal *) checkval;
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return gcv->mapped_check[val - gcv->frst];
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}
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PG_FUNCTION_INFO_V1(gin_ts_consistent);
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Datum gin_ts_consistent(PG_FUNCTION_ARGS);
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Datum
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gin_ts_consistent(PG_FUNCTION_ARGS)
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{
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bool *check = (bool *) PG_GETARG_POINTER(0);
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QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_DATUM(2));
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bool res = FALSE;
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if (query->size > 0)
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{
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int4 i,
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j = 0;
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ITEM *item;
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GinChkVal gcv;
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gcv.frst = item = GETQUERY(query);
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gcv.mapped_check = (bool *) palloc(sizeof(bool) * query->size);
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for (i = 0; i < query->size; i++)
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if (item[i].type == VAL)
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gcv.mapped_check[i] = check[j++];
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res = TS_execute(
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GETQUERY(query),
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&gcv,
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true,
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checkcondition_gin
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);
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}
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PG_FREE_IF_COPY(query, 2);
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PG_RETURN_BOOL(res);
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}
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