Horton

Re: path toward faster partition pruning

David Rowley <david.rowley@2ndquadrant.com>

View thread View on postgr.es
From: David Rowley <david.rowley@2ndquadrant.com>
To: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>
Cc: Dilip Kumar <dilipbalaut@gmail.com>, Rajkumar Raghuwanshi <rajkumar.raghuwanshi@enterprisedb.com>, Beena Emerson <memissemerson@gmail.com>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2017-11-06T04:15:30Z
Lists: pgsql-hackers 
On 31 October 2017 at 21:43, Amit Langote <Langote_Amit_f8@lab.ntt.co.jp> wrote:
> Attached updated version of the patches

match_clauses_to_partkey() needs to allow for the way quals on Bool
columns are represented.

create table pt (a bool not null) partition by list (a);
create table pt_true partition of pt for values in('t');
create table pt_false partition of pt for values in('f');
explain select * from pt where a = true;
                            QUERY PLAN
------------------------------------------------------------------
 Append  (cost=0.00..76.20 rows=2810 width=1)
   ->  Seq Scan on pt_false  (cost=0.00..38.10 rows=1405 width=1)
         Filter: a
   ->  Seq Scan on pt_true  (cost=0.00..38.10 rows=1405 width=1)
         Filter: a
(5 rows)

match_clause_to_indexcol() shows an example of how to handle this.

explain select * from pt where a = false;

will need to be allowed too. This works slightly differently.

-- 
 David Rowley                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

Commits

  1. Fix assorted partition pruning bugs

  2. Make gen_partprune_steps static

  3. Remove useless 'default' clause

  4. Reorganize partitioning code

  5. Use custom hash opclass for hash partition pruning

  6. Blindly attempt to fix sepgsql tests broken due to 9fdb675fc5.

  7. Attempt to fix endianess issues in new hash partition test.

  8. Faster partition pruning

  9. For partitionwise join, match on partcollation, not parttypcoll.

  10. Revise API for partition bound search functions.

  11. Revise API for partition_rbound_cmp/partition_rbound_datum_cmp.

  12. Fix possible crash in partition-wise join.

  13. Refactor code for partition bound searching

  14. New C function: bms_add_range

  15. Add extensive tests for partition pruning.

  16. Add null test to partition constraint for default range partitions.

  17. Remove BufFile's isTemp flag.

  18. Make OWNER TO subcommand mention consistent

  19. Fix index matching for operators with mixed collatable/noncollatable inputs.