Markus Bertheau <[EMAIL PROTECTED]> writes:
> В Сбт, 17.04.2004, в 01:45, Tom Lane пишет:
>> The planner sees that as "where scope = <some complicated expression>"
>> and falls back to a default estimate.  It won't simplify a sub-select
>> to a constant.  (Some people consider that a feature ;-).)

> Why?

It's the only way to prevent it from simplifying when you don't want it

                        regards, tom lane

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