Postgres Pro
Downloads
Home   >   mailing lists

Re: Proposed patch to make mergejoin cost estimation more symmetric - Mailing list pgsql-patches

From Tom Lane
Subject Re: Proposed patch to make mergejoin cost estimation more symmetric
Date
Msg-id 19574.1197038922@sss.pgh.pa.us
Whole thread Raw
In response to Re: Proposed patch to make mergejoin cost estimation more symmetric  (Simon Riggs <simon@2ndquadrant.com>)
Responses Re: Proposed patch to make mergejoin cost estimation more symmetric
Re: Proposed patch to make mergejoin cost estimation more symmetric
List pgsql-patches
Tree view 
Simon Riggs <simon@2ndquadrant.com> writes:
> I do have a longer term issue that there is no information provided by
> EXPLAIN to allow us to differentiate these two conditions.

Sure there is: the new startup condition affects the estimated plan
startup cost (only) and the existing termination condition affects the
estimated total cost (only).

            regards, tom lane

pgsql-patches by date:

Previous
From: Gregory Stark
Date:
Subject: Re: Proposed patch to make mergejoin cost estimation more symmetric
Next
From: Tom Lane
Date:
Subject: Re: Proposed patch to make mergejoin cost estimation more symmetric