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  <br...@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

+ As you are, so once was I. As I am, so you will be. +
+                     Ancient Roman grave inscription +

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