Zoltan Haindrich created HIVE-21152:
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Summary: Rewrite if expression to case and recognize simple case
as an if
Key: HIVE-21152
URL: https://issues.apache.org/jira/browse/HIVE-21152
Project: Hive
Issue Type: Improvement
Components: CBO
Reporter: Zoltan Haindrich
* {{IF}} is not part of the sql standard; however given its special form its
simpler - and currently in Hive it also has vectorized support
* there people writing standard sql may write: {{CASE WHEN member=1 THEN attr+1
else attr+2 END}} which is essentially an if.
The idea is to rewrite IFs to CASEs for the cbo; and recognize simple "CASE"-s
as IFs to get vectorization on them if possible
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