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https://issues.apache.org/jira/browse/HIVE-21152?focusedWorklogId=729087&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-729087
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ASF GitHub Bot logged work on HIVE-21152:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 17/Feb/22 17:12
Start Date: 17/Feb/22 17:12
Worklog Time Spent: 10m
Work Description: kgyrtkirk merged pull request #2791:
URL: https://github.com/apache/hive/pull/2791
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Issue Time Tracking
-------------------
Worklog Id: (was: 729087)
Time Spent: 20m (was: 10m)
> 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
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-21152.01.patch, HIVE-21152.02.patch,
> HIVE-21152.03.patch, HIVE-21152.04.patch, HIVE-21152.05.patch,
> HIVE-21152.06.patch, HIVE-21152.07.patch
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> * {{IF}} is not part of the sql standard; however given its special form its
> simpler - and currently in Hive it also has vectorized support
> * 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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