Jesus Camacho Rodriguez created HIVE-14431:
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Summary: Recognize COALESCE as CASE and extend CASE simplification
to cover more cases
Key: HIVE-14431
URL: https://issues.apache.org/jira/browse/HIVE-14431
Project: Hive
Issue Type: Improvement
Components: CBO
Affects Versions: 2.2.0
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
Transform:
{code}
(COALESCE(a, '') = '') OR
(a = 'A' AND b = c) OR
(a = 'B' AND b = d) OR
(a = 'C' AND b = e) OR
(a = 'D' AND b = f) OR
(a = 'E' AND b = g) OR
(a = 'F' AND b = h)
{code}
into:
{code}
(a='') OR
(a is null) OR
(a = 'A' AND b = c) OR
(a = 'B' AND b = d) OR
(a = 'C' AND b = e) OR
(a = 'D' AND b = f) OR
(a = 'E' AND b = g) OR
(a = 'F' AND b = h)
{code}
With complex queries, this will lead us to factor more predicates that could be
pushed to the TS.
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