Add regression tests for REPLICA IDENTITY with dropped indexes
REPLICA IDENTITY USING INDEX behaves the same way as NOTHING if the
associated index is dropped, even if there is a primary key that could
be used as a fallback for the changes generated. There have never been
any tests to cover such scenarios, so this commit closes the gap.
Author: Michael Paquier
Reviewed-by: Masahiko Sawada, Rahila Syed, Euler Taveira
Discussion: https://postgr.es/m/
20200522035028.GO2355@paquier.xyz