RE: BUG #16031: Group by returns duplicate groups

All the lc_* settings are en-US, and server_encoding is UTF8.

-----Original Message-----
From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Sent: Monday, September 30, 2019 2:17 PM
To: David Raymond <David(dot)Raymond(at)tomtom(dot)com>
Cc: pgsql-bugs(at)lists(dot)postgresql(dot)org
Subject: Re: BUG #16031: Group by returns duplicate groups

PG Bug reporting form <noreply(at)postgresql(dot)org> writes:
> I have a large table which I'm running a query on, grouping on a single
> field, and returning only that 1 field, filtered with a HAVING clause. The
> results that I'm getting back however contain a duplicate entry for one of
> the returned values, which I believe should never be able to happen.

That seems quite weird. What LC_COLLATE/LC_CTYPE settings are you using?

regards, tom lane