Horton

Re: Implement targetlist SRFs using ROWS FROM() (was Changed SRF in targetlist handling)

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: pgsql-hackers@postgresql.org, Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-08-28T03:38:04Z
Lists: pgsql-hackers 
On 2016-08-27 14:48:29 -0700, Andres Freund wrote:
> My next steps are to work on cleaning up the code a bit more, and
> increase the regression coverage.

Oh, there's one open item I actually don't really know how to handle
well: A decent way of enforcing the join order between the subquery and
the functionscan when there's no lateral dependencies.  I've hacked up
the lateral machinery to just always add a pointless dependency, but
that seems fairly ugly.  If somebody has a better idea, that'd be great.

Greetings,

Andres Freund

Commits

  1. Remove obsoleted code relating to targetlist SRF evaluation.

  2. Doc: improve documentation of new SRF-in-tlist behavior.

  3. Move targetlist SRF handling from expression evaluation to new executor node.

  4. Don't split up SRFs when choosing to postpone SELECT output expressions.