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https://issues.apache.org/jira/browse/HIVE-16809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16036048#comment-16036048
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Ashutosh Chauhan commented on HIVE-16809:
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I also ArrayIndexOutOfBoundException for cases where RexCall only has 1
operand. Seems like also need check of if (operands.size() != 2) return op;
> Improve filter condition for correlated subqueries
> --------------------------------------------------
>
> Key: HIVE-16809
> URL: https://issues.apache.org/jira/browse/HIVE-16809
> Project: Hive
> Issue Type: Improvement
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Attachments: HIVE-16809.1.patch, HIVE-16809.2.patch,
> HIVE-16809.3.patch
>
>
> A filter condition such as {{col1=col1}} generated during rewrite of
> subqueries is not folded/rewritten into {{co1 is not null}}. This messes up
> the statistic estimation and could result in bad plans.
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