On 2018-Nov-27, PG Bug reporting form wrote:
> PostgreSQL version: 11.1
> Operating system: macOS High Sierra
> Description:
>
> ERROR: column p.proisagg does not exist
> LINE 6: WHEN p.proisagg THEN 'agg'
Ugh ... looks like we should have a test script that runs psql against
all older supported versions with all backslash commands to ensure
everything works correctly. Cross-version support is not complicated,
we just need to remind people to do it.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services