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
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/e353389d24da48c708f72379f87e9b518baac521
Modified Files
--------------
src/backend/partitioning/partprune.c | 78 ++++++++++++++-------------
src/test/regress/expected/partition_prune.out | 41 ++++++++++++++
src/test/regress/sql/partition_prune.sql | 7 +++
3 files changed, 90 insertions(+), 36 deletions(-)
