On Tue, Jun 14, 2016 at 03:24:12PM -0500, Jim Nasby wrote:
> On 6/8/16 4:36 PM, Bruce Momjian wrote:
> >Just a follow-up, but even with a randomized correlation order, it seems
> >25% restrictivity generates a Bitmap Index Scan:
>
> AFAIK we do the bitmap heap scan in heap order, thereby eliminating the
> effect of correlation?
High correlation would still cause us to access fewer heap pages than
random data.
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
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