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https://issues.apache.org/jira/browse/HIVE-5920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13837999#comment-13837999
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Eric Hanson commented on HIVE-5920:
-----------------------------------
This syntax uses GenericUDFWhen internally.
> Implement vectorized support for CASE WHEN a THEN b [WHEN c THEN d]* [ELSE e]
> END
> ----------------------------------------------------------------------------------
>
> Key: HIVE-5920
> URL: https://issues.apache.org/jira/browse/HIVE-5920
> Project: Hive
> Issue Type: Sub-task
> Reporter: Eric Hanson
>
> Implement vectorized support for the second of the two types of CASE
> expressions:
> CASE WHEN a THEN b [WHEN c THEN d]* [ELSE e] END
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