David Fetter <david@fetter.org> writes:
> SELECT count(DISTINCT i) OVER () FROM (VALUES (1),(2),(3),(1)) AS s(i);
> ERROR: DISTINCT is not implemented for window functions
Which part of that message isn't clear to you?
> Anyhow, I think it's a bug and needs back-patching.
"Not implemented" is not a bug. Nice try though.
regards, tom lane