Re: [COMMITTERS] pgsql: Implement table partitioning.

On 2016/12/22 0:31, Robert Haas wrote:
> On Tue, Dec 20, 2016 at 12:22 PM, Alvaro Herrera
> <alvherre(at)2ndquadrant(dot)com> wrote:
>> Robert Haas wrote:
>>> Implement table partitioning.
>>
>> I thought it was odd to use rd_rel->reloftype as a boolean in
>> ATExecAttachPartition, but apparently we do it elsewhere too, so let's
>> leave that complaint for another day.
>
> Ugh. I agree - that's bad style.

Agreed, fixed in the attached patch.

>> What I also found off in the same function is that we use
>> SearchSysCacheCopyAttName() on each attribute and then don't free the
>> result, and don't ever use the returned tuple either. A simple fix, I
>> thought, just remove the "Copy" and add a ReleaseSysCache().
>
> Or use SearchSysCachExists.

Done, too.

>> But then I
>> noticed this whole thing is rather strange -- why not pass a boolean
>> flag down to CreateInheritance() and from there to
>> MergeAttributesIntoExisting() to implement the check? That seems less
>> duplicative.
>
> Hmm, that would be another way to do it.

MergeAttributesIntoExisting() is called by ATExecAddInherit() as well,
where we don't want to check that. Sure, we can only check if
child_is_partition, but I thought it'd be better to keep the shared code
(between regular inheritance and partitioning) as close to the old close
as possible.

Attached patch also fixes a couple of other minor issues.

Thanks,
Amit