Horton

Re: 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: Rafia Sabih <rafia.sabih@enterprisedb.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>, Rajkumar Raghuwanshi <rajkumar.raghuwanshi@enterprisedb.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2017-07-20T06:05:43Z
Lists: pgsql-hackers 
On Wed, Jul 19, 2017 at 9:54 AM, Rafia Sabih
<rafia.sabih@enterprisedb.com> wrote:
>
> Partition information:
> Type of partitioning - single column range partition
> Tables partitioned - Lineitem and orders
>
> Lineitem -
> Partition key = l_orderkey
> No of partitions = 18
>
> Orders -
> Partition key = o_orderkey
> No of partitions = 11
>

The patch set upto 0015 would refuse to join two partitioned relations
using a partition-wise join if they have different number of
partitions. Next patches implement a more advanced partition matching
algorithm only for list partitions. Those next patches would refuse to
apply partition-wise join for range partitioned tables. So, I am
confused as to how come partition-wise join is being chosen even when
the number of partitions differ.

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

Commits

  1. Basic partition-wise join functionality.

  2. Assorted preparatory refactoring for partition-wise join.

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

  4. Stamp 10beta2.

  5. Eat XIDs more efficiently in recovery TAP test.

  6. Abstract logic to allow for multiple kinds of child rels.

  7. Implement SortSupport for macaddr data type

  8. Attempt to stabilize grouping sets regression test plans.

  9. Teach xlogreader to follow timeline switches

  10. Don't scan partitioned tables.

  11. Fix grammar.

  12. postgres_fdw: Push down FULL JOINs with restriction clauses.

  13. Some preliminary refactoring towards partitionwise join.

  14. contrib/amcheck needs RecentGlobalXmin to be PGDLLIMPORT'ified.

  15. Print test parameters like "foo: 123", and results like "foo = 123".