Re: Adding qualification conditions to EXPLAIN output

On Sat, 09 Mar 2002 18:02:17 -0500
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> I have been fooling around with adding decompiled display of plan
> qualification conditions to EXPLAIN output. With this, you can
> for example tell the difference between indexscanned and
> not-indexscanned clauses, without having to dig through EXPLAIN
> VERBOSE dumps. Here is an example motivated by Rob Hoopman's
> recent query on pgsql-general:
...
> Question for the group: does this seem valuable enough to put into the
> standard EXPLAIN output, or should it be a special option? I can
> imagine showing it only in EXPLAIN VERBOSE's summary display, or adding
> a GUC variable to enable it, or adding another option keyword to
> EXPLAIN, but I don't much want to do any of those things. On the other
> hand, maybe this stuff won't make any sense to non-experts anyway.
> Thoughts?

AFAIC, I'd think adding another keyword is better if the standard
EXPLAIN is extended.

e.g.
EXPLAIN keyword SELECT * FROM ...
EXPLAIN ANALYZE keyword SELECT * FROM ...

Regards,
Masaru Sugawara