| From: | Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com> |
|---|---|
| To: | Amit Khandekar <amitdkhan(dot)pg(at)gmail(dot)com> |
| Cc: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Robert Haas <robertmhaas(at)gmail(dot)com>, Etsuro Fujita <fujita(dot)etsuro(at)lab(dot)ntt(dot)co(dot)jp>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Rafia Sabih <rafia(dot)sabih(at)enterprisedb(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: | 2017-09-13 07:35:51 |
| Message-ID: | CAFjFpRdfa9aCqV5Bv-1Biuurzexw00yQJ7v_Wn4VDLdMnrNv8w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Sep 13, 2017 at 12:32 PM, Amit Khandekar <amitdkhan(dot)pg(at)gmail(dot)com> wrote:
> Hi,
>
> Rafia had done some testing on TPCH queries using Partition-wise join
> patch along with Parallel Append patch.
>
> There, we had observed that for query 4, even though the partition
> wise joins are under a Parallel Append, the join are all non-partial.
>
> Specifically, the partition-wise join has non-partial nested loop
> joins when actually it was expected to have partial nested loop joins.
> (The difference can be seen by the observation that the outer relation
> of that join is scanned by non-parallel Bitmap Heap scan when it
> should have used Parallel Bitmap Heap Scan).
>
> Here is the detailed analysis , including where I think is the issue :
>
> https://www.postgresql.org/message-id/CAJ3gD9cZms1ND3p%3DNN%3DhDYDFt_SeKq1htMBhbj85bOmvJwY5fg%40mail.gmail.com
>
> All the TPCH results are posted in the same above mail thread.
Can you please check if the attached patch fixes the issue.
--
Best Wishes,
Ashutosh Bapat
EnterpriseDB Corporation
The Postgres Database Company
| Attachment | Content-Type | Size |
|---|---|---|
| reparameterize_partial_nestloop_inner.patch | text/x-patch | 3.0 KB |
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