Bruce Momjian <maillist@candle.pha.pa.us> writes:
>> Bruce Momjian <maillist@candle.pha.pa.us> writes:
>>>> Yes, the subqueries need work. We don't even do index lookups into the
>>>> inner plan, only sequential. Already on TODO.
>>
>> Huh? I don't follow that at all...
> Suppose you have a subquery that returns 1000 rows. There is no code so
> lookups of the inner table are indexed:
> select *
> from tab
> where col in (select col2 from tab2)
> In this case, a sequential scan of the subquery results are required.
Well, yes, the subquery is a sequential scan. I guess what you are
envisioning is rewriting this into some kind of nested-loop join?
For simple cases that might be possible...
regards, tom lane
