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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.
132 lines
2.7 KiB
C
132 lines
2.7 KiB
C
#include "_int.h"
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PG_FUNCTION_INFO_V1(ginint4_queryextract);
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Datum ginint4_queryextract(PG_FUNCTION_ARGS);
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Datum
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ginint4_queryextract(PG_FUNCTION_ARGS)
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{
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int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
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StrategyNumber strategy = PG_GETARG_UINT16(2);
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Datum *res = NULL;
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*nentries = 0;
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if (strategy == BooleanSearchStrategy)
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{
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QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM_COPY(PG_GETARG_POINTER(0));
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ITEM *items = GETQUERY(query);
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int i;
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if (query->size == 0)
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PG_RETURN_POINTER(NULL);
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if (shorterquery(items, query->size) == 0)
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elog(ERROR, "Query requires full scan, GIN doesn't support it");
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pfree(query);
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query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_POINTER(0));
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items = GETQUERY(query);
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res = (Datum *) palloc(sizeof(Datum) * query->size);
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*nentries = 0;
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for (i = 0; i < query->size; i++)
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if (items[i].type == VAL)
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{
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res[*nentries] = Int32GetDatum(items[i].val);
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(*nentries)++;
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}
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}
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else
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{
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ArrayType *query = PG_GETARG_ARRAYTYPE_P(0);
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int4 *arr;
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uint32 i;
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CHECKARRVALID(query);
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*nentries = ARRNELEMS(query);
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if (*nentries > 0)
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{
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res = (Datum *) palloc(sizeof(Datum) * (*nentries));
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arr = ARRPTR(query);
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for (i = 0; i < *nentries; i++)
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res[i] = Int32GetDatum(arr[i]);
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}
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}
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if ( nentries == 0 )
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{
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switch( strategy )
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{
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case BooleanSearchStrategy:
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case RTOverlapStrategyNumber:
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*nentries = -1; /* nobody can be found */
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break;
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default: /* require fullscan: GIN can't find void arrays */
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break;
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}
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}
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PG_RETURN_POINTER(res);
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}
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PG_FUNCTION_INFO_V1(ginint4_consistent);
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Datum ginint4_consistent(PG_FUNCTION_ARGS);
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Datum
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ginint4_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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int res = FALSE;
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/*
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* we can do not check array carefully, it's done by previous
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* ginarrayextract call
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*/
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switch (strategy)
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{
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case RTOverlapStrategyNumber:
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case RTContainedByStrategyNumber:
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case RTOldContainedByStrategyNumber:
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/* at least one element in check[] is true, so result = true */
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res = TRUE;
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break;
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case RTSameStrategyNumber:
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case RTContainsStrategyNumber:
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case RTOldContainsStrategyNumber:
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res = TRUE;
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do
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{
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ArrayType *query = PG_GETARG_ARRAYTYPE_P(2);
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int i,
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nentries = ARRNELEMS(query);
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for (i = 0; i < nentries; i++)
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if (!check[i])
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{
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res = FALSE;
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break;
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}
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} while (0);
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break;
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case BooleanSearchStrategy:
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do
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{
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QUERYTYPE *query = (QUERYTYPE *) PG_DETOAST_DATUM(PG_GETARG_POINTER(2));
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res = ginconsistent(query, check);
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} while (0);
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break;
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default:
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elog(ERROR, "ginint4_consistent: unknown strategy number: %d", strategy);
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}
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PG_RETURN_BOOL(res);
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}
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