EXPLAIN/EXPLAIN ANALYZE REFRESH MATERIALIZED VIEW

Hi,

Currently, $subject is not allowed. We do plan the mat view query
before every refresh. I propose to show the explain/explain analyze of
the select part of the mat view in case of Refresh Mat View(RMV). It
will be useful for the user to know what exactly is being planned and
executed as part of RMV. Please note that we already have
explain/explain analyze CTAS/Create Mat View(CMV), where we show the
explain/explain analyze of the select part. This proposal will do the
same thing.

The behaviour can be like this:
EXPLAIN REFRESH MATERIALIZED VIEW mv1; --> will not refresh the mat
view, but shows the select part's plan of mat view.
EXPLAIN ANALYZE REFRESH MATERIALIZED VIEW mv1; --> will refresh the
mat view and shows the select part's plan of mat view.

Thoughts? If okay, I will post a patch later.

With Regards,
Bharath Rupireddy.
EnterpriseDB: http://www.enterprisedb.com