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https://issues.apache.org/jira/browse/HIVE-6708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13948262#comment-13948262
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Jitendra Nath Pandey commented on HIVE-6708:
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[~rhbutani] This bug is causing some correctness issues, therefore this fix
should also go to hive-0.13.
> ConstantVectorExpression should create copies of data objects rather than
> referencing them
> ------------------------------------------------------------------------------------------
>
> Key: HIVE-6708
> URL: https://issues.apache.org/jira/browse/HIVE-6708
> Project: Hive
> Issue Type: Bug
> Reporter: Hari Sankar Sivarama Subramaniyan
> Assignee: Hari Sankar Sivarama Subramaniyan
> Attachments: HIVE-6708-1.patch, HIVE-6708-3.patch, HIVE-6708-4.patch,
> HIVE-6708.2.patch
>
>
> 1. ConstantVectorExpression vector should be updated for bytecolumnvectors
> and decimalColumnVectors. The current code changes the reference to the
> vector which might be shared across multiple columns
> 2. VectorizationContext.foldConstantsForUnaryExpression(ExprNodeDesc
> exprDesc) has a minor bug as to when to constant fold the expression.
> The following code should replace the corresponding piece of code in the
> trunk.
> ..
> GenericUDF gudf = ((ExprNodeGenericFuncDesc) exprDesc).getGenericUDF();
> if (gudf instanceof GenericUDFOPNegative || gudf instanceof
> GenericUDFOPPositive
> || castExpressionUdfs.contains(gudf.getClass())
> ...
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