Re: PG 13 release notes, first draft

On Mon, May 11, 2020 at 05:33:40PM -0700, Peter Geoghegan wrote:
> On Mon, May 11, 2020 at 5:14 PM Bruce Momjian <bruce@momjian.us> wrote:
> > Agreed.  How is this?
> >
> >         This allows efficient btree indexing of low cardinality columns.
> >         Users upgrading with pg_upgrade will need to use REINDEX to make use of
> >         this feature.
> 
> I still think that the release notes should say that the key is only
> stored once, while TIDs that identify table rows are stored together
> as an array. Everything that's helpful (or harmful) about the feature
> happens as a consequence of that. This isn't hard to grasp
> intuitively, and is totally in line with how things like Oracle bitmap
> indexes are presented to ordinary users.

I still don't think these details belong in the release notes.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EnterpriseDB                             https://enterprisedb.com

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