commit 5e9f10d34cc2ba6e18b469a3a5ae3ed9f5f306b1
author Aman Sinha <amsinha@cloudera.com> Wed Aug 19 18:59:05 2020 -0700
committer Impala Public Jenkins <impala-public-jenkins@cloudera.com> Wed Sep 02 22:57:55 2020 +0000
tree 4865b23c5d021b58264b0f98641c5241cdbc85d6
parent f9936549dcab58390c5662ebdedb9c60838185a4

IMPALA-10064: Support constant propagation for eligible range predicates

This patch adds support for constant propagation of range predicates
involving date and timestamp constants. Previously, only equality
predicates were considered for propagation. The new type of propagation
is shown by the following example:

Before constant propagation:
 WHERE date_col = CAST(timestamp_col as DATE)
  AND timestamp_col BETWEEN '2019-01-01' AND '2020-01-01'
After constant propagation:
 WHERE date_col >= '2019-01-01' AND date_col <= '2020-01-01'
  AND timestamp_col >= '2019-01-01' AND timestamp_col <= '2020-01-01'
  AND date_col = CAST(timestamp_col as DATE)

As a consequence, since Impala supports table partitioning by date
columns but not timestamp columns, the above propagation enables
partition pruning based on timestamp ranges.

Existing code for equality based constant propagation was refactored
and consolidated into a new class which handles both equality and
range based constant propagation. Range based propagation is only
applied to date and timestamp columns.

Testing:
 - Added new range constant propagation tests to PlannerTest.
 - Added e2e test for range constant propagation based on a newly
   added date partitioned table.
 - Ran precommit tests.

Change-Id: I811a1f8d605c27c7704d7fc759a91510c6db3c2b
Reviewed-on: http://gerrit.cloudera.org:8080/16346
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>