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9b5c8d45f6
"consistent" functions, and remove pg_amop.opreqcheck, as per recent discussion. The main immediate benefit of this is that we no longer need 8.3's ugly hack of requiring @@@ rather than @@ to test weight-using tsquery searches on GIN indexes. In future it should be possible to optimize some other queries better than is done now, by detecting at runtime whether the index match is exact or not. Tom Lane, after an idea of Heikki's, and with some help from Teodor.
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
#include "trgm.h"
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#include "access/gin.h"
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#include "access/itup.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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PG_FUNCTION_INFO_V1(gin_extract_trgm);
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Datum gin_extract_trgm(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(gin_trgm_consistent);
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Datum gin_trgm_consistent(PG_FUNCTION_ARGS);
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Datum
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gin_extract_trgm(PG_FUNCTION_ARGS)
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{
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text *val = (text *) PG_GETARG_TEXT_P(0);
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int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
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Datum *entries = NULL;
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TRGM *trg;
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int4 trglen;
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*nentries = 0;
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trg = generate_trgm(VARDATA(val), VARSIZE(val) - VARHDRSZ);
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trglen = ARRNELEM(trg);
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if (trglen > 0)
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{
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trgm *ptr;
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int4 i = 0,
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item;
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*nentries = (int32) trglen;
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entries = (Datum *) palloc(sizeof(Datum) * trglen);
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ptr = GETARR(trg);
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while (ptr - GETARR(trg) < ARRNELEM(trg))
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{
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item = TRGMINT(ptr);
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entries[i++] = Int32GetDatum(item);
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ptr++;
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}
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}
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PG_RETURN_POINTER(entries);
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}
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Datum
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gin_trgm_consistent(PG_FUNCTION_ARGS)
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{
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bool *check = (bool *) PG_GETARG_POINTER(0);
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/* StrategyNumber strategy = PG_GETARG_UINT16(1); */
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text *query = PG_GETARG_TEXT_P(2);
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bool *recheck = (bool *) PG_GETARG_POINTER(3);
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bool res = FALSE;
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TRGM *trg;
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int4 i,
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trglen,
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ntrue = 0;
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/* All cases served by this function are inexact */
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*recheck = true;
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trg = generate_trgm(VARDATA(query), VARSIZE(query) - VARHDRSZ);
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trglen = ARRNELEM(trg);
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for (i = 0; i < trglen; i++)
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if (check[i])
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ntrue++;
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#ifdef DIVUNION
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res = (trglen == ntrue) ? true : ((((((float4) ntrue) / ((float4) (trglen - ntrue)))) >= trgm_limit) ? true : false);
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#else
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res = (trglen == 0) ? false : ((((((float4) ntrue) / ((float4) trglen))) >= trgm_limit) ? true : false);
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#endif
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PG_RETURN_BOOL(res);
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}
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