Horton

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

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>, 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: 2017-04-06T15:40:26Z
Lists: pgsql-hackers 
Robert Haas <robertmhaas@gmail.com> writes:
> ... But the underlying point here is that
> the only thing you really know about the function is that it's got to
> be a strategy-3 operator in some btree opclass; if that guarantees
> strictness, then so be it -- but I wasn't able to find anything in the
> code or documentation off-hand that supports that contention, so we
> might need to think a bit more about why (or if) this is guaranteed to
> be true.

FWIW, I do not think that follows.  If you want to check that the
function is strict, check that explicitly.

It's very likely that in practice, all such functions are indeed strict,
but we don't have an assumption about that wired into the planner.

			regards, tom lane

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".