"Cestmir Hybl" <cestmirl@freeside.sk> writes:
>> In fact, I need to filter by expression ((A is null) or (A > const)).
I wonder whether you shouldn't reconsider your data representation.
Perhaps the condition you are using "null" for would be better
represented by setting A to infinity. (The float and timestamp
datatypes actually have a concept of infinity; for other types you
can fake it with a large positive value.)
regards, tom lane
