Michael Paquier <michael.paquier@gmail.com> writes:
> This is one of those issues where it would be cool to only plan and
> execute the query creating the materialized view query with NO DATA
> without planning and executing it first, and do the actual planning
> and execution at the first refresh. A similar problem was discussed
> here:
>
https://www.postgresql.org/message-id/flat/20160115175546.2968.6033%40wrigleys.postgresql.org#20160115175546.2968.6033@wrigleys.postgresql.org
> Thought I don't think that it is that straight-forward, the relation
> defined using a CTAS uses column information directly derived from the
> query planned, so the fix would be to extract the necessary
> information for those columns: collation, column name, type OID and
> typemod without the need of the existing routines.
I think you want to be looking at the way that CREATE VIEW accomplishes
the same task. See DefineView and DefineVirtualRelation. It might be
worth refactoring those a bit to allow code sharing.
regards, tom lane
