Re: Feature: temporary materialized views

Hi Andreas,

On Tue, Feb 05, 2019 at 12:59:12PM +0900, Michael Paquier wrote:
> Now...  You have on this thread all the audience which already worked
> on 874fe3a.  And I am just looking at this patch, evaluating the
> behavior change this is introducing.  Still I would recommend a
> separate thread as others may want to comment on that particular
> point.

So I have read through your patch, and there are a couple of things
which I think we could simplify more.  Here are my notes:
1) We could remove the into clause from DR_intorel, which is used for
two things:
- Determine the relkind of the relation created.  However the relation
gets created before entering in the executor, and we already know its
OID, so we also know its relkind.
- skipData is visibly always false.
We may want to keep skipData to have an assertion at the beginning of
inforel_startup for sanity purposes though.
2) DefineIntoRelForDestReceiver is just a wrapper for
create_ctas_nodata, so we had better just merge both of them and
expose directly the routine creating the relation definition, so the
new interface is a bit awkward.
3) The part about the regression diff is well...  Expected...  We may
want a comment about that.  We could consider as well adding a
regression test inspired from REINDEX SCHEMA to show that the CTAS is
created before the data is actually filled in.
--
Michael