/*
** The GiST Consistent method for _intments
** Should return false if for all data items x below entry,
** the predicate x op query == FALSE, where op is the oper
** corresponding to strategy in the pg_amop table.
*/
Datum
g_int_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
ArrayType *query = (ArrayType *) PG_DETOAST_DATUM_COPY(PG_GETARG_POINTER(1));
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
bool retval;
if (strategy == BooleanSearchStrategy) {
retval =execconsistent((QUERYTYPE *) query,
(ArrayType *) DatumGetPointer(entry->key),
ISLEAFKEY((ArrayType *) DatumGetPointer(entry->key)));
pfree( query );
PG_RETURN_BOOL(retval);
}
/* sort query for fast search, key is already sorted */
if (ARRISVOID(query)) {
pfree( query );
PG_RETURN_BOOL(false);
}
PREPAREARR(query);
switch (strategy)
{
case RTOverlapStrategyNumber:
retval = inner_int_overlap((ArrayType *) DatumGetPointer(entry->key),
query);
break;
case RTSameStrategyNumber:
if (GIST_LEAF(entry))
DirectFunctionCall3(
g_int_same,
entry->key,
PointerGetDatum(query),
PointerGetDatum(&retval)
);
else
retval = inner_int_contains((ArrayType *) DatumGetPointer(entry->key),
query);
break;
case RTContainsStrategyNumber:
retval = inner_int_contains((ArrayType *) DatumGetPointer(entry->key),
query);
break;
case RTContainedByStrategyNumber:
if (GIST_LEAF(entry))
retval = inner_int_contains(query,
(ArrayType *) DatumGetPointer(entry->key));
else
retval = inner_int_overlap((ArrayType *) DatumGetPointer(entry->key),
query);
break;
default:
retval = FALSE;
}
pfree( query );
PG_RETURN_BOOL(retval);
}
/*
** The GiST Consistent method for _intments
** Should return false if for all data items x below entry,
** the predicate x op query == FALSE, where op is the oper
** corresponding to strategy in the pg_amop table.
*/
Datum
g_int_consistent(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
ArrayType *query = (ArrayType *) PG_GETARG_POINTER(1);
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
bool retval;
if (strategy == BooleanSearchStrategy)
PG_RETURN_BOOL(execconsistent((QUERYTYPE *) query,
(ArrayType *) DatumGetPointer(entry->key),
ISLEAFKEY((ArrayType *) DatumGetPointer(entry->key))));
/* XXX are we sure it's safe to scribble on the query object here? */
/* XXX what about toasted input? */
/* sort query for fast search, key is already sorted */
if (ARRISVOID(query))
PG_RETURN_BOOL(false);
PREPAREARR(query);
switch (strategy)
{
case RTOverlapStrategyNumber:
retval = inner_int_overlap((ArrayType *) DatumGetPointer(entry->key),
query);
break;
case RTSameStrategyNumber:
if (GIST_LEAF(entry))
DirectFunctionCall3(
g_int_same,
entry->key,
PointerGetDatum(query),
PointerGetDatum(&retval)
);
else
retval = inner_int_contains((ArrayType *) DatumGetPointer(entry->key),
query);
break;
case RTContainsStrategyNumber:
retval = inner_int_contains((ArrayType *) DatumGetPointer(entry->key),
query);
break;
case RTContainedByStrategyNumber:
if (GIST_LEAF(entry))
retval = inner_int_contains(query,
(ArrayType *) DatumGetPointer(entry->key));
else
retval = inner_int_overlap((ArrayType *) DatumGetPointer(entry->key),
query);
break;
default:
retval = FALSE;
}
PG_RETURN_BOOL(retval);
}
Datum
g_int_decompress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval;
ArrayType *r;
int *dr,
lenr;
ArrayType *in;
int lenin;
int *din;
int i,
j;
in = (ArrayType *) PG_DETOAST_DATUM(entry->key);
if (ARRISVOID(in))
PG_RETURN_POINTER(entry);
lenin = ARRNELEMS(in);
if (lenin < 2 * MAXNUMRANGE || ISLEAFKEY(in))
{ /* not compressed value */
if (in != (ArrayType *) DatumGetPointer(entry->key))
{
retval = palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(in),
entry->rel, entry->page, entry->offset, VARSIZE(in), FALSE);
PG_RETURN_POINTER(retval);
}
PG_RETURN_POINTER(entry);
}
din = ARRPTR(in);
lenr = internal_size(din, lenin);
r = new_intArrayType(lenr);
dr = ARRPTR(r);
for (i = 0; i < lenin; i += 2)
for (j = din[i]; j <= din[i + 1]; j++)
if ((!i) || *(dr - 1) != j)
*dr++ = j;
if (in != (ArrayType *) DatumGetPointer(entry->key))
pfree(in);
retval = palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(r),
entry->rel, entry->page, entry->offset, VARSIZE(r), FALSE);
PG_RETURN_POINTER(retval);
}
/*
** GiST Compress and Decompress methods
*/
Datum
g_int_compress(PG_FUNCTION_ARGS)
{
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
GISTENTRY *retval;
ArrayType *r;
int len;
int *dr;
int i,
min,
cand;
if (entry->leafkey)
{
r = (ArrayType *) PG_DETOAST_DATUM_COPY(entry->key);
PREPAREARR(r);
r->flags |= LEAFKEY;
retval = palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(r),
entry->rel, entry->page, entry->offset, VARSIZE(r), FALSE);
PG_RETURN_POINTER(retval);
}
r = (ArrayType *) PG_DETOAST_DATUM(entry->key);
if (ISLEAFKEY(r) || ARRISVOID(r))
{
if (r != (ArrayType *) DatumGetPointer(entry->key))
pfree(r);
PG_RETURN_POINTER(entry);
}
if ((len = ARRNELEMS(r)) >= 2 * MAXNUMRANGE)
{ /* compress */
if (r == (ArrayType *) DatumGetPointer(entry->key))
r = (ArrayType *) PG_DETOAST_DATUM_COPY(entry->key);
r = resize_intArrayType(r, 2 * (len));
dr = ARRPTR(r);
for (i = len - 1; i >= 0; i--)
dr[2 * i] = dr[2 * i + 1] = dr[i];
len *= 2;
cand = 1;
while (len > MAXNUMRANGE * 2)
{
min = 0x7fffffff;
for (i = 2; i < len; i += 2)
if (min > (dr[i] - dr[i - 1]))
{
min = (dr[i] - dr[i - 1]);
cand = i;
}
memmove((void *) &dr[cand - 1], (void *) &dr[cand + 1], (len - cand - 1) * sizeof(int));
len -= 2;
}
r = resize_intArrayType(r, len);
retval = palloc(sizeof(GISTENTRY));
gistentryinit(*retval, PointerGetDatum(r),
entry->rel, entry->page, entry->offset, VARSIZE(r), FALSE);
PG_RETURN_POINTER(retval);
}
else
PG_RETURN_POINTER(entry);
PG_RETURN_POINTER(entry);
}
