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

Hi Tom,

Yes, we indeed get the cost of the plan at the first line itself. Somehow,
I missed this point. We just in fact implemented this functionality and its
working. Thanks again.

Regards,
Srinivas Karthik

On Tue, Jul 12, 2016 at 6:43 AM, Craig Ringer <craig(at)2ndquadrant(dot)com> wrote:

> 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/
> PostgreSQL Development, 24x7 Support, Training & Services
>