postgresql/contrib/btree_gist/btree_date.c
Teodor Sigaev 7b81988f9b - Add aligment of variable data types
- Add aligment for interval data types
- Avoid floating point overflow in penalty functions
Janko Richter <jankorichter@yahoo.de> and teodor
2004-06-03 12:26:10 +00:00

193 lines
5.0 KiB
C

#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/date.h"
typedef struct
{
DateADT lower;
DateADT upper;
} dateKEY;
/*
** date ops
*/
PG_FUNCTION_INFO_V1(gbt_date_compress);
PG_FUNCTION_INFO_V1(gbt_date_union);
PG_FUNCTION_INFO_V1(gbt_date_picksplit);
PG_FUNCTION_INFO_V1(gbt_date_consistent);
PG_FUNCTION_INFO_V1(gbt_date_penalty);
PG_FUNCTION_INFO_V1(gbt_date_same);
Datum gbt_date_compress(PG_FUNCTION_ARGS);
Datum gbt_date_union(PG_FUNCTION_ARGS);
Datum gbt_date_picksplit(PG_FUNCTION_ARGS);
Datum gbt_date_consistent(PG_FUNCTION_ARGS);
Datum gbt_date_penalty(PG_FUNCTION_ARGS);
Datum gbt_date_same(PG_FUNCTION_ARGS);
static bool gbt_dategt (const void *a, const void *b)
{
return DatumGetBool(
DirectFunctionCall2(date_gt,DateADTGetDatum( *((DateADT*)a) ), DateADTGetDatum( *((DateADT*)b) ) )
);
}
static bool gbt_datege (const void *a, const void *b)
{
return DatumGetBool(
DirectFunctionCall2(date_ge,DateADTGetDatum( *((DateADT*)a) ), DateADTGetDatum( *((DateADT*)b) ) )
);
}
static bool gbt_dateeq (const void *a, const void *b)
{
return DatumGetBool(
DirectFunctionCall2(date_eq,DateADTGetDatum( *((DateADT*)a) ), DateADTGetDatum( *((DateADT*)b) ) )
);
}
static bool gbt_datele (const void *a, const void *b)
{
return DatumGetBool(
DirectFunctionCall2(date_le,DateADTGetDatum( *((DateADT*)a) ), DateADTGetDatum( *((DateADT*)b) ) )
);
}
static bool gbt_datelt (const void *a, const void *b)
{
return DatumGetBool(
DirectFunctionCall2(date_lt,DateADTGetDatum( *((DateADT*)a) ), DateADTGetDatum( *((DateADT*)b) ) )
);
}
static int
gbt_datekey_cmp(const void *a, const void *b)
{
if ( gbt_dategt( (void*)&(((Nsrt *) a)->t[0]) , (void*)&(((Nsrt *) b)->t[0]) ) ){
return 1;
} else
if ( gbt_datelt( (void*)&(((Nsrt *) a)->t[0]) , (void*)&(((Nsrt *) b)->t[0]) ) ){
return -1;
}
return 0;
}
static const gbtree_ninfo tinfo =
{
gbt_t_date,
sizeof(DateADT),
gbt_dategt,
gbt_datege,
gbt_dateeq,
gbt_datele,
gbt_datelt,
gbt_datekey_cmp
};
/**************************************************
* date ops
**************************************************/
Datum
gbt_date_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval = NULL;
PG_RETURN_POINTER( gbt_num_compress( retval , entry , &tinfo ));
}
Datum
gbt_date_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
DateADT query = PG_GETARG_DATEADT( 1 );
dateKEY *kkk = (dateKEY *) DatumGetPointer(entry->key);
GBT_NUMKEY_R key ;
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
key.lower = (GBT_NUMKEY*) &kkk->lower ;
key.upper = (GBT_NUMKEY*) &kkk->upper ;
PG_RETURN_BOOL(
gbt_num_consistent( &key, (void*)&query,&strategy,GIST_LEAF(entry),&tinfo)
);
}
Datum
gbt_date_union(PG_FUNCTION_ARGS)
{
GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
void *out = palloc(sizeof(dateKEY));
*(int *) PG_GETARG_POINTER(1) = sizeof(dateKEY);
PG_RETURN_POINTER( gbt_num_union ( (void*)out, entryvec, &tinfo ) );
}
Datum
gbt_date_penalty(PG_FUNCTION_ARGS)
{
dateKEY *origentry = (dateKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
dateKEY *newentry = (dateKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
float *result = (float *) PG_GETARG_POINTER(2);
int32 diff, res ;
diff = DatumGetInt32(DirectFunctionCall2(
date_mi,
DateADTGetDatum(newentry->upper),
DateADTGetDatum(origentry->upper)));
res = Max(diff, 0);
diff = DatumGetInt32(DirectFunctionCall2(
date_mi,
DateADTGetDatum(origentry->lower),
DateADTGetDatum(newentry->lower)));
res += Max(diff, 0);
*result = 0.0;
if ( res > 0 ){
diff = DatumGetInt32(DirectFunctionCall2(
date_mi,
DateADTGetDatum(origentry->upper),
DateADTGetDatum(origentry->lower)));
*result += FLT_MIN ;
*result += (float) ( res / ( (double) ( res + diff ) ) );
*result *= ( FLT_MAX / ( ( (GISTENTRY *) PG_GETARG_POINTER(0))->rel->rd_att->natts + 1 ) );
}
PG_RETURN_POINTER(result);
}
Datum
gbt_date_picksplit(PG_FUNCTION_ARGS)
{
PG_RETURN_POINTER(gbt_num_picksplit(
(GistEntryVector *) PG_GETARG_POINTER(0),
(GIST_SPLITVEC *) PG_GETARG_POINTER(1),
&tinfo
));
}
Datum
gbt_date_same(PG_FUNCTION_ARGS)
{
dateKEY *b1 = (dateKEY *) PG_GETARG_POINTER(0);
dateKEY *b2 = (dateKEY *) PG_GETARG_POINTER(1);
bool *result = (bool *) PG_GETARG_POINTER(2);
*result = gbt_num_same ( (void*)b1, (void*)b2, &tinfo );
PG_RETURN_POINTER(result);
}