Re: More WITH

On Mon, Aug 17, 2015 at 10:22:11AM -0700, Josh Berkus wrote:
>
> > EXPLAIN [ANALYZE]
>
> Would be tricky. We don't currently have any way to wrap an EXPLAIN
> in any larger statement, do we?

We do, but it's kinda horrible.

CREATE OR REPLACE FUNCTION get_something_from_explain(your_query)
RETURNS TEXT
LANGUAGE plpgsql /* uh oh */
AS $$
DECLARE
foo JSON;
BEGIN
EXECUTE format('EXPLAIN (FORMAT json), your_query) INTO foo;
RETURN foo #>> '{bar,baz,quux}';
END;
$$;

> Would be very useful for automated query analysis, though.

Among many other things, certainly :)

> > SHOW
>
> Not very useful, easy to work around (pg_settings).

This particular one is just about being consistent, or the way I look
at it, about avoiding surprising users with inconsistencies.

Cheers,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter
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