float
gistpenalty(GISTSTATE *giststate, int attno,
GISTENTRY *orig, bool isNullOrig,
GISTENTRY *add, bool isNullAdd)
{
float penalty = 0.0;
if (giststate->penaltyFn[attno].fn_strict == false ||
(isNullOrig == false && isNullAdd == false))
{
FunctionCall3Coll(&giststate->penaltyFn[attno],
giststate->supportCollation[attno],
PointerGetDatum(orig),
PointerGetDatum(add),
PointerGetDatum(&penalty));
/* disallow negative or NaN penalty */
if (isnan(penalty) || penalty < 0.0)
penalty = 0.0;
}
else if (isNullOrig && isNullAdd)
penalty = 0.0;
else
{
/* try to prevent mixing null and non-null values */
penalty = get_float4_infinity();
}
return penalty;
}
static Datum
leftmostvalue_float4(void)
{
return Float4GetDatum(-get_float4_infinity());
}