Horton

Re: bitmap scan and explain analyze

Tatsuo Ishii <t-ishii@sra.co.jp>

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From: Tatsuo Ishii <t-ishii@sra.co.jp>
To: tgl@sss.pgh.pa.us
Cc: pgsql-hackers@postgresql.org
Date: 2005-05-05T03:09:36Z
Lists: pgsql-hackers 
> > Why actual rows=0?
> 
> I couldn't think of any reasonably cheap way to count the actual rows
> (especially in the presence of lossy bitmaps), so I just punted.

I see.

BTW is it possible to let BitmapHeapScan fetch tuples by TID order? It
would make heap acccess in sequential manner and would boost disk
access performance.
--
Tatsuo Ishii