Re: Changing the result set to contain the cost of the optimizer's chosen plan

On 11 July 2016 at 23:29, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Srinivas Karthik V <skarthikv(dot)iitb(at)gmail(dot)com> writes:
> > Specifically, I have a Java program which calls
> > ResultSet rs = statement.executeQuery("explain select * from table");
> > I would like to change PostgreSQL such that ResultSet rs should contain a
> > field that contains also the cost of the optimizer chosen plan.
>
> Why do you need to change anything? The cost is right there in the
> first line of the result text. It might be easier to parse out if
> you use one of EXPLAIN's intended-to-be-machine-readable output
> formats, though. <http://www.postgresql.org/mailpref/pgsql-hackers>

Yeah - if we were going to do this at all, it'd want to be output that
decomposes _all_ the explain output into columns. But since we can emit
json, xml, etc, I don't really see the point.

--
Craig Ringer http://www.2ndQuadrant.com/
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