Horton

Re: [HACKERS] Runtime Partition Pruning

Jesper Pedersen <jesper.pedersen@redhat.com>

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From: Jesper Pedersen <jesper.pedersen@redhat.com>
To: David Rowley <david.rowley@2ndquadrant.com>
Cc: Rajkumar Raghuwanshi <rajkumar.raghuwanshi@enterprisedb.com>, Beena Emerson <memissemerson@gmail.com>, Alvaro Herrera <alvherre@alvh.no-ip.org>, Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>, Robert Haas <robertmhaas@gmail.com>, amul sul <sulamul@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, Dilip Kumar <dilipbalaut@gmail.com>
Date: 2018-02-22T15:11:52Z
Lists: pgsql-hackers 
Hi David,

On 02/21/2018 04:06 AM, David Rowley wrote:
> I've attached v11 of the patch.
> 

Are UPDATE and DELETE suppose to be supported ?

With

-- test.sql --
CREATE TABLE test (a integer NOT NULL, b integer) PARTITION BY HASH(a);
CREATE TABLE test_p00 PARTITION OF test FOR VALUES WITH (MODULUS 2, 
REMAINDER 0);
CREATE TABLE test_p01 PARTITION OF test FOR VALUES WITH (MODULUS 2, 
REMAINDER 1);
CREATE INDEX idx_test_a ON test (a);
CREATE INDEX idx_test_b ON test (b);

INSERT INTO test (SELECT i,i FROM generate_series(1, 1000000) AS i);

ANALYZE;
-- test.sql --

and

UPDATE test SET b = 1 WHERE a = ?
DELETE FROM test WHERE a = ?

both shows that all partitions are scanned;

  Update on test
    Update on test_p00
    Update on test_p01
    ->  Index Scan using test_p00_a_idx on test_p00
          Index Cond: (a = 1)
    ->  Index Scan using test_p01_a_idx on test_p01
          Index Cond: (a = 1)

Using prune_v32 and runtime_v11 with conflicts resolved.

Best regards,
  Jesper

Commits

  1. Initialize ExprStates once in run-time partition pruning

  2. Add bms_prev_member function

  3. Support partition pruning at execution time

  4. Document partprune.c a little better

  5. Fix crash in pg_replication_slot_advance

  6. Add parallel-aware hash joins.

  7. Fix typo.

  8. Allow --with-bonjour to work with non-macOS implementations of Bonjour.

  9. Mention need for --no-inc-recursive in rsync command