BUG #15871: Regression in 11.4 altering type on column with an index

On Monday, June 24, 2019, PG Bug reporting form <noreply(at)postgresql(dot)org>
wrote:

> The following bug has been logged on the website:
>
> Bug reference: 15871
> Logged by: Tom Dunstan
> Email address: pgsql(at)tomd(dot)cc
> PostgreSQL version: 11.4
> Operating system: Linux x86_64 (Alpine 3.9)
> Description:
>
> test=# ALTER TABLE FOO ALTER ts1 TYPE TIMESTAMP WITH TIME ZONE, ALTER ts2
> TYPE TIMESTAMP WITH TIME ZONE;
> ERROR: 42P07: relation "foo_ts1_idx" already exists
> LOCATION: index_create, index.c:877
>
> Necessary condition seems to be:
> - Multiple columns altered in the same statement
> - Both altered columns have an index
>

Seems to be the same behavior as BUG #1586 whose fix just got applied today
and will appear in the next point release.

David J.