On Mon, May 11, 2020 at 6:23 PM Bruce Momjian <br...@momjian.us> wrote: > OK, I was able to add some of it cleanly: > > This allows efficient btree indexing of low cardinality columns by > storing duplicate keys only once. Users upgrading with pg_upgrade > will need to use REINDEX to make use of this feature.
That seems like a reasonable compromise. Thanks! -- Peter Geoghegan
