Horton

Fix partition pruning with IS [NOT] NULL clauses

Alvaro Herrera <alvherre@alvh.no-ip.org>

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Commit: e353389d24da48c708f72379f87e9b518baac521
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2018-07-16T22:38:59Z
Releases: 12.0 
Fix partition pruning with IS [NOT] NULL clauses

The original code was unable to prune partitions that could not possibly
contain NULL values, when the query specified less than all columns in a
multicolumn partition key.  Reorder the if-tests so that it is, and add
more commentary and regression tests.

Reported-by: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>
Co-authored-by: Dilip Kumar <dilipbalaut@gmail.com>
Co-authored-by: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>
Co-authored-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>
Reviewed-by: amul sul <sulamul@gmail.com>
Discussion: https://postgr.es/m/CAFjFpRc7qjLUfXLVBBC_HAnx644sjTYM=qVoT3TJ840HPbsTXw@mail.gmail.com

Files

PathChange+/−
src/backend/partitioning/partprune.c modified +42 −36
src/test/regress/expected/partition_prune.out modified +41 −0
src/test/regress/sql/partition_prune.sql modified +7 −0

Discussion