Remove pg_class.relhaspkey

Peter Eisentraut <peter_e@gmx.net>

Commit: f66e8bf875f691db4c5d0173fc39b5a9c3ec969c
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2018-03-14T19:31:34Z
Releases: 11.0
Remove pg_class.relhaspkey

It is not used for anything internally, and it cannot be relied on for
external uses, so it can just be removed.  To correct recommended way to
check for a primary key is in pg_index.

Discussion: https://www.postgresql.org/message-id/flat/b1a24c6c-6913-f89c-674e-0704f0ed69db@2ndquadrant.com

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