Re: Old-style OR indexscan slated for destruction

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От Oleg Bartunov
Тема Re: Old-style OR indexscan slated for destruction
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Msg-id Pine.GSO.4.62.0504250044550.4489@ra.sai.msu.su
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Ответ на Old-style OR indexscan slated for destruction  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Old-style OR indexscan slated for destruction  (Christopher Kings-Lynne <chriskl@familyhealth.com.au>)
Список pgsql-hackers
On Sun, 24 Apr 2005, Tom Lane wrote:

> I am about to rip out the code that supports multiple indexscans for OR
> conditions inside a single IndexScan plan node.  As best I can tell,
> the new-style bitmap-OR code is as fast or faster than the old way
> even in fully cached test cases (ie, with no allowance for improved
> efficiency of disk access).  So there's no percentage in maintaining
> support for the old way, and getting rid of it will allow simplification
> of code and data structures in the planner.

very good, Tom !

>
>             regards, tom lane
>
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    Regards,        Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83


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