| From: | Rafia Sabih <rafia(dot)sabih(at)enterprisedb(dot)com> |
|---|---|
| To: | Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com> |
| Cc: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Robert Haas <robertmhaas(at)gmail(dot)com>, Rajkumar Raghuwanshi <rajkumar(dot)raghuwanshi(at)enterprisedb(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Partition-wise join for join between (declaratively) partitioned tables |
| Date: | 2017-07-26 09:34:46 |
| Message-ID: | CAOGQiiNNebyAm+OVvd8baH1CTXEQAVpEkZ=htgjsUafK3eujnw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Jul 26, 2017 at 12:02 PM, Ashutosh Bapat
<ashutosh(dot)bapat(at)enterprisedb(dot)com> wrote:
>
> Ok. If those queries have equi-join between partitioned tables and are
> not picking up partition-wise join, that case needs to be
> investigated. Q21 for example has join between three lineitem
> instances. Those joins can be executed by partition-wise join. But it
> may so happen that optimal join order doesn't join partitioned tables
> with each other, thus interleaving partitioned tables with
> unpartitioned or differently partitioned tables in join order.
> Partition-wise join is not possible then. A different partitioning
> scheme may be required there.
>
Good point, will look into this direction as well.
--
Regards,
Rafia Sabih
EnterpriseDB: http://www.enterprisedb.com/
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