On 2017/06/02 18:10, Etsuro Fujita wrote:
> On 2017/05/16 21:36, Etsuro Fujita wrote:
>> One approach I came up with to fix this issue is to rewrite the
>> targetList entries of an inherited UPDATE/DELETE properly using
>> rewriteTargetListUD, when generating a plan for each child table in
>> inheritance_planner. Attached is a WIP patch for that. Maybe I am
>> missing something, though.
>
> While updating the patch, I noticed the patch rewrites the UPDATE
> targetList incorrectly in some cases; rewrite_inherited_tlist I added to
> adjust_appendrel_attrs (1) removes all junk items from the targetList
> and (2) adds junk items for the child table using rewriteTargetListUD,
> but it's wrong to drop all junk items in cases where there are junk
> items for some other reasons than rewriteTargetListUD. Consider junk
> items containing MULTIEXPR SubLink. One way I came up with to fix this
> is to change (1) to only remove junk items with resname; since junk
> items added by rewriteTargetListUD should have resname (note: we would
> need resname to call ExecFindJunkAttributeInTlist at execution time!)
> while other junk items wouldn't have resname (see
> transformUpdateTargetList), we could correctly replace junk items added
> by rewriteTargetListUD for the parent with ones for the child, by that
> change. I might be missing something, though. Comments welcome.
I updated the patch that way. Please find attached an updated version.
Other changes:
* Moved the initialization for "tupleid" I added in ExecModifyTable as
discussed before, which I think is essentially the same as proposed by
Ildus in [1], since I think that would be more consistent with "oldtuple".
* Added regression tests.
Anyway I'll add this to the next commitfest.
Best regards,
Etsuro Fujita
[1]
https://www.postgresql.org/message-id/20170514150525.0346ba72%40postgrespro.ru
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