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https://issues.apache.org/jira/browse/HIVE-20406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16584488#comment-16584488
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Ashutosh Chauhan commented on HIVE-20406:
-----------------------------------------
+1 pending tests
> Nested Coalesce giving incorrect results
> ----------------------------------------
>
> Key: HIVE-20406
> URL: https://issues.apache.org/jira/browse/HIVE-20406
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Affects Versions: 3.0.0
> Reporter: Riju Trivedi
> Assignee: Vineet Garg
> Priority: Critical
> Attachments: HIVE-20406.1.patch, HIVE-20406.2.patch
>
>
> Below query is returning NULL instead of 'TEST'
> select coalesce(coalesce(null), 'TEST');
> {noformat}
> INFO : OK
> +-------+
> | _c0 |
> +-------+
> | NULL |
> +-------+
> {noformat}
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