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https://issues.apache.org/jira/browse/HIVE-14619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15437716#comment-15437716
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Ashutosh Chauhan commented on HIVE-14619:
-----------------------------------------
+1
> CASE folding can produce wrong expression
> -----------------------------------------
>
> Key: HIVE-14619
> URL: https://issues.apache.org/jira/browse/HIVE-14619
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Affects Versions: 2.1.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Critical
> Attachments: HIVE-14619.patch
>
>
> This is a case that was not covered in the testsuite. For the following query:
> {code:sql}
> select (CASE WHEN key = value THEN '1' WHEN true THEN '0' ELSE NULL END)
> from src
> {code}
> Currently, we end up folding the select expression to '0', as we fail bail
> out in the second statement and fail to account that there are two different
> possible values for the CASE expression ('1' and '0').
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