On Fri, Mar 2, 2018 at 11:12 AM, Alexander Kuzmenkov
<a.kuzmenkov@postgrespro.ru> wrote:
> On 16.01.2018 10:49, Jeff Davis wrote:
>> My proposed fix is to make an internal opfamily identical to the
>> external one, such that it's not recognized as part of the same EC,
>> and the planner won't try to eliminate it. It loses out on potential
>> optimizations, but those are mostly theoretical since the btree
>> opclass ordering for ranges is not very interesting to a user.
>
> I think I figured out what to do with missing sort directions. We can change
> select_outer_pathkeys_for_merge() to generate the pathkeys we need. Also,
> find_mergeclauses_for_outer_pathkeys() has to be changed too, so that it
> knows which pathkeys are compatible to which range join clauses.
>
> About the patch, do I understand it right that you are working on the next
> version now?
I think we are quite clearly past the deadline to submit a new patch
for inclusion in v11 at this point.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
