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postgresql/contrib/intarray/_int_gin.c
Peter Eisentraut b8b2e3b2de Replace int2/int4 in C code with int16/int32
The latter was already the dominant use, and it's preferable because
in C the convention is that intXX means XX bits.  Therefore, allowing
mixed use of int2, int4, int8, int16, int32 is obviously confusing.

Remove the typedefs for int2 and int4 for now.  They don't seem to be
widely used outside of the PostgreSQL source tree, and the few uses
can probably be cleaned up by the time this ships.
2012-06-25 01:51:46 +03:00

185 lines
4.1 KiB
C

/*
* contrib/intarray/_int_gin.c
*/
#include "postgres.h"
#include "access/gin.h"
#include "access/gist.h"
#include "access/skey.h"
#include "_int.h"
PG_FUNCTION_INFO_V1(ginint4_queryextract);
Datum ginint4_queryextract(PG_FUNCTION_ARGS);
Datum
ginint4_queryextract(PG_FUNCTION_ARGS)
{
int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
StrategyNumber strategy = PG_GETARG_UINT16(2);
int32 *searchMode = (int32 *) PG_GETARG_POINTER(6);
Datum *res = NULL;
*nentries = 0;
if (strategy == BooleanSearchStrategy)
{
QUERYTYPE *query = PG_GETARG_QUERYTYPE_P(0);
ITEM *items = GETQUERY(query);
int i;
/* empty query must fail */
if (query->size <= 0)
PG_RETURN_POINTER(NULL);
/*
* If the query doesn't have any required primitive values (for
* instance, it's something like '! 42'), we have to do a full index
* scan.
*/
if (query_has_required_values(query))
*searchMode = GIN_SEARCH_MODE_DEFAULT;
else
*searchMode = GIN_SEARCH_MODE_ALL;
/*
* Extract all the VAL items as things we want GIN to check for.
*/
res = (Datum *) palloc(sizeof(Datum) * query->size);
*nentries = 0;
for (i = 0; i < query->size; i++)
{
if (items[i].type == VAL)
{
res[*nentries] = Int32GetDatum(items[i].val);
(*nentries)++;
}
}
}
else
{
ArrayType *query = PG_GETARG_ARRAYTYPE_P(0);
CHECKARRVALID(query);
*nentries = ARRNELEMS(query);
if (*nentries > 0)
{
int32 *arr;
int32 i;
res = (Datum *) palloc(sizeof(Datum) * (*nentries));
arr = ARRPTR(query);
for (i = 0; i < *nentries; i++)
res[i] = Int32GetDatum(arr[i]);
}
switch (strategy)
{
case RTOverlapStrategyNumber:
*searchMode = GIN_SEARCH_MODE_DEFAULT;
break;
case RTContainedByStrategyNumber:
case RTOldContainedByStrategyNumber:
/* empty set is contained in everything */
*searchMode = GIN_SEARCH_MODE_INCLUDE_EMPTY;
break;
case RTSameStrategyNumber:
if (*nentries > 0)
*searchMode = GIN_SEARCH_MODE_DEFAULT;
else
*searchMode = GIN_SEARCH_MODE_INCLUDE_EMPTY;
break;
case RTContainsStrategyNumber:
case RTOldContainsStrategyNumber:
if (*nentries > 0)
*searchMode = GIN_SEARCH_MODE_DEFAULT;
else /* everything contains the empty set */
*searchMode = GIN_SEARCH_MODE_ALL;
break;
default:
elog(ERROR, "ginint4_queryextract: unknown strategy number: %d",
strategy);
}
}
PG_RETURN_POINTER(res);
}
PG_FUNCTION_INFO_V1(ginint4_consistent);
Datum ginint4_consistent(PG_FUNCTION_ARGS);
Datum
ginint4_consistent(PG_FUNCTION_ARGS)
{
bool *check = (bool *) PG_GETARG_POINTER(0);
StrategyNumber strategy = PG_GETARG_UINT16(1);
int32 nkeys = PG_GETARG_INT32(3);
/* Pointer *extra_data = (Pointer *) PG_GETARG_POINTER(4); */
bool *recheck = (bool *) PG_GETARG_POINTER(5);
bool res = FALSE;
int32 i;
switch (strategy)
{
case RTOverlapStrategyNumber:
/* result is not lossy */
*recheck = false;
/* at least one element in check[] is true, so result = true */
res = TRUE;
break;
case RTContainedByStrategyNumber:
case RTOldContainedByStrategyNumber:
/* we will need recheck */
*recheck = true;
/* at least one element in check[] is true, so result = true */
res = TRUE;
break;
case RTSameStrategyNumber:
/* we will need recheck */
*recheck = true;
/* Must have all elements in check[] true */
res = TRUE;
for (i = 0; i < nkeys; i++)
{
if (!check[i])
{
res = FALSE;
break;
}
}
break;
case RTContainsStrategyNumber:
case RTOldContainsStrategyNumber:
/* result is not lossy */
*recheck = false;
/* Must have all elements in check[] true */
res = TRUE;
for (i = 0; i < nkeys; i++)
{
if (!check[i])
{
res = FALSE;
break;
}
}
break;
case BooleanSearchStrategy:
{
QUERYTYPE *query = PG_GETARG_QUERYTYPE_P(2);
/* result is not lossy */
*recheck = false;
res = gin_bool_consistent(query, check);
}
break;
default:
elog(ERROR, "ginint4_consistent: unknown strategy number: %d",
strategy);
}
PG_RETURN_BOOL(res);
}