Horton

Re: [HACKERS] Partition-wise join for join between (declaratively) partitioned tables

Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>

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From: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>
To: Thomas Munro <thomas.munro@enterprisedb.com>
Cc: Rajkumar Raghuwanshi <rajkumar.raghuwanshi@enterprisedb.com>, Robert Haas <robertmhaas@gmail.com>, Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>, Etsuro Fujita <fujita.etsuro@lab.ntt.co.jp>, Rafia Sabih <rafia.sabih@enterprisedb.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2018-06-06T03:51:54Z
Lists: pgsql-hackers 
On Wed, Jun 6, 2018 at 8:11 AM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> On Mon, Mar 5, 2018 at 8:13 PM, Rajkumar Raghuwanshi
> <rajkumar.raghuwanshi@enterprisedb.com> wrote:
>> On Wed, Feb 7, 2018 at 2:00 PM, Ashutosh Bapat
>> Changed partition-wise statement to partitionwise.
>> Attached re-based patch.
>>
>>> The patch looks good to me. I don't think we can reduce it further.
>>> But we need some tests to test PWJ with default partitions. Marking
>>> this as ready for committer.
>
> Hi Rajkumar,
>
> partition_join ... FAILED
>

That made my heart stop for fraction of a second. I thought, something
happened which caused partition_join test fail in master. But then I
realised you are talking about Rajkumar's patch and test in that
patch. I think it's better to start a separate thread discussing his
patch, before I loose my heart ;)

-- 
Best Wishes,
Ashutosh Bapat
EnterpriseDB Corporation
The Postgres Database Company

Commits

  1. Add test for partitionwise join involving default partition.

  2. Rewrite the code that applies scan/join targets to paths.

  3. Fix code related to partitioning schemes for dropped columns.

  4. Copy information from the relcache instead of pointing to it.

  5. Basic partition-wise join functionality.

  6. Associate partitioning information with each RelOptInfo.

  7. Expand partitioned table RTEs level by level, without flattening.

  8. Set partitioned_rels appropriately when UNION ALL is used.

  9. Remove dedicated B-tree root-split record types.

  10. Assorted preparatory refactoring for partition-wise join.

  11. Teach adjust_appendrel_attrs(_multilevel) to do multiple translations.

  12. Avoid unnecessary single-child Append nodes.

  13. Revisit handling of UNION ALL subqueries with non-Var output columns.