| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | amul sul <sulamul(at)gmail(dot)com>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Rajkumar Raghuwanshi <rajkumar(dot)raghuwanshi(at)enterprisedb(dot)com>, Etsuro Fujita <fujita(dot)etsuro(at)lab(dot)ntt(dot)co(dot)jp>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Antonin Houska <ah(at)cybertec(dot)at>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] advanced partition matching algorithm for partition-wise join |
| Date: | 2019-05-17 12:20:04 |
| Message-ID: | CA+TgmoaeP5ck6sOGWjFOhNH6mrxX09Ua7u5NfdwrSAjjbFkx6Q@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, May 14, 2019 at 12:24 AM Amit Langote
<Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> wrote:
> He did mention that cases where the nullable side is provably empty can be
> handled by simply returning the path of the non-nullable side with
> suitable projection path added on top to emit NULLs for the columns of the
> nullable-side. If we teach populate_joinrel_with_paths() and underlings
> about that, then we can allow partitionwise join even in the case where
> the nullable side has some partitions missing.
Yes, I think that would be a good approach to pursue.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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