Re: [HACKERS] Explain plan output

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Ansley, Michael" <Michael(dot)Ansley(at)intec(dot)co(dot)za>
Cc: "'pgsql-hackers(at)postgreSQL(dot)org'" <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: [HACKERS] Explain plan output
Date: 1999-12-27 15:51:05
Message-ID: 26149.946309865@sss.pgh.pa.us
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"Ansley, Michael" <Michael(dot)Ansley(at)intec(dot)co(dot)za> writes:
> Anyway, the point of this mail is to say that I have altered the explain
> code slightly, so that it dumps the results of the explain into a
> table.

What do you mean by that, exactly? You can't expect to fit long explain
outputs into a single table row, so I suppose it's one row per line.
How are the rows identified? What's the expected declaration of the
table?

> I find that a lot more convenient

It strikes me as a lot less convenient for the sorts of things I use
explain for. But I wouldn't object if it were an optional feature:

EXPLAIN [ VERBOSE ] [ INTO <table> ] <query>

which would also solve your problem of figuring out which table to write
to.

> e) The plan id is output using elog. How would I ensure that this gets back
> to any arbitrary client. If I understand right, elogs don't go to ODBC, and
> possibly other, clients.

What's a "plan id", and is it actually necessary?

regards, tom lane

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