Re: Remove lossy-operator RECHECK flag?

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От Guillaume Smet
Тема Re: Remove lossy-operator RECHECK flag?
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Msg-id 1d4e0c10804111142w12bd3860qcd140b11755dff2a@mail.gmail.com
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Ответ на Remove lossy-operator RECHECK flag?  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Remove lossy-operator RECHECK flag?  (Tom Lane <tgl@sss.pgh.pa.us>)
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On Fri, Apr 11, 2008 at 7:41 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>  Offhand I suspect
>  only the PostGIS project would be affected.

Just wanted to point out that I personnally use the capability to
remove the RECHECK of PostGIS opclass (I define a similar opclass
without the recheck) when I enforce the SRID in the application: the
overhead of rechecking the rows returned by the index scan is really
noticeable (for nothing if your SRID is the same in all your
application and data - that's what I read some time ago, hope it's
still true).

I don't know how you think PostGIS should fix their opclass after
RECHECK removal. But I'd like to have a way to keep the ability to
remove the RECHECK on my own if it's possible so I hope it won't be
hardcoded in C code somewhere.

-- 
Guillaume


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