Re: Premature view materialization in 8.2?

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От Tom Lane
Тема Re: Premature view materialization in 8.2?
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Msg-id 261.1175840636@sss.pgh.pa.us
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Ответ на Re: Premature view materialization in 8.2?  ("Jonathan Ellis")
Ответы Re: Premature view materialization in 8.2?  ("Jonathan Ellis")
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Premature view materialization in 8.2?  ("Jonathan Ellis", )
 Re: Premature view materialization in 8.2?  (Tom Lane, )
  Re: Premature view materialization in 8.2?  ("Jonathan Ellis", )
   Re: Premature view materialization in 8.2?  (Tom Lane, )
    Re: Premature view materialization in 8.2?  ("Jonathan Ellis", )
     Re: Premature view materialization in 8.2?  (Tom Lane, )
      Re: Premature view materialization in 8.2?  ("Jonathan Ellis", )
       Re: Premature view materialization in 8.2?  (Tom Lane, )
        Re: Premature view materialization in 8.2?  ("Jonathan Ellis", )
         Re: Premature view materialization in 8.2?  (Tom Lane, )
          Re: Premature view materialization in 8.2?  ("Jonathan Ellis", )
"Jonathan Ellis" <> writes:
> On 4/5/07, Tom Lane <> wrote:
>>> Is this a regression, or a "feature" of 8.2?
>>
>> Hard to say without EXPLAIN ANALYZE output to compare.

> To my eye they are identical other than the speed but perhaps I am
> missing something.

Yeah, it sure is the same plan, and 8.2 seems to be a tad faster right
up to the hash join on user_id.  Is user_id a textual datatype?  I'm
wondering if the 8.2 installation is using a different locale --- the
speed of simple string comparisons can be horrifically worse in some
locales compared to others.

            regards, tom lane

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