Re: performance issue: logical operators are slow inside SQL function: missing optimalization?

2010/8/29 Tom Lane <tgl@sss.pgh.pa.us>:
> Pavel Stehule <pavel.stehule@gmail.com> writes:
>> I testing a simple use case and I was surprised with very slow
>> execution of SQL functions
>
> The one case is inline-able and the other not (because it would result
> in double evaluation of the volatile function random()).
> See EXPLAIN VERBOSE.

I understand now. So it means general advice - don't use a boolean
operators in SQL function? This issue should be documented somewhere?

Regards

Pavel Stehule

>
>                        regards, tom lane
>