Horton

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

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>
Cc: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>, Rafia Sabih <rafia.sabih@enterprisedb.com>, Rajkumar Raghuwanshi <rajkumar.raghuwanshi@enterprisedb.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2017-05-19T14:16:22Z
Lists: pgsql-hackers 
On Thu, May 18, 2017 at 4:38 AM, Ashutosh Bapat
<ashutosh.bapat@enterprisedb.com> wrote:
> But in case a user has written an = operator which returns true for
> two NULL values, per description in [1], that comparison operator is
> flawed and
> using that operator is going to result in SQL-standard-incompliant
> behaviour. I have tried to preserve all the relevant portions of
> discussion in this mail. Am I missing something?

Yes.  You're confusing friendly advice about how to write good SQL
with internals documentation about how the system actually works.  The
documentation we have about how operator classes and index methods and
so forth actually work under the hood is in
https://www.postgresql.org/docs/devel/static/xindex.html -- as a
developer, that's what you should be looking at.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL 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".