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From "Eric Hanson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5757) Implement vectorized support for CASE a WHEN b THEN c [WHEN d THEN e]* [ELSE f] END
Date Tue, 03 Dec 2013 01:03:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13837173#comment-13837173
] 

Eric Hanson commented on HIVE-5757:
-----------------------------------

Splitting the work for CASE into 2 parts, for the two different kinds of CASE.

> Implement vectorized support for CASE a WHEN b THEN c [WHEN d THEN e]* [ELSE f] END 
> ------------------------------------------------------------------------------------
>
>                 Key: HIVE-5757
>                 URL: https://issues.apache.org/jira/browse/HIVE-5757
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Eric Hanson
>
> Implement full, end-to-end support for CASE in vectorized mode, including new VectorExpression
class(es), VectorizationContext translation to a VectorExpression, and unit tests for these,
as well as end-to-end ad hoc testing. An end-to-end .q test is recommended but optional.
> This is high priority because CASE is a fairly popular expression.



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