On Sun, Nov 7, 2010 at 1:08 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Marko Tiikkaja <marko.tiikkaja@cs.helsinki.fi> writes:
>> On 2010-11-07 6:23 PM +0200, Tom Lane wrote:
>>> Um ... why? I thought the whole point of breaking out ModifyTable
>>> as a separate node type was so that a query involving writeable CTEs
>>> would still be just one plan tree.
>
>> We tried that for 9.0 and it didn't work. Almost all work for 9.1 has
>> been spent on creating an infrastructure for running the executor
>> separately for every WITH list element when wCTEs are present.
>
> I guess I shoulda been paying closer attention :-(. That really, really
> seems like fundamentally the wrong direction. What was it that was
> unfixable about the other way? If it is unfixable, should we revert
> ModifyTable?
The relevant thread is here:
http://archives.postgresql.org/pgsql-hackers/2010-02/msg00783.php
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
