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https://issues.apache.org/jira/browse/HIVE-3638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486555#comment-13486555
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Shreepadma Venugopalan commented on HIVE-3638:
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@Chris: Can you update the JIRA with the change in behavior? In the case of
this particular test, Hive deviates from the SQL standard and outputs an empty
result set instead of a NULL result set when an aggregate function is run on an
empty table/partition. I believe MR2 generates splits even though the input
directory in empty and Hive in turn outputs an empty result set. The behavior
on MR1 used to be the same as MR2, until a recent change that went into HDFS.
It would really help to see the failure you are seeing on hadoop23.
> metadataonly1.q test fails with Hadoop23
> ----------------------------------------
>
> Key: HIVE-3638
> URL: https://issues.apache.org/jira/browse/HIVE-3638
> Project: Hive
> Issue Type: Bug
> Components: Tests
> Affects Versions: 0.10.0, 0.9.1
> Reporter: Chris Drome
>
> Hive creates an empty file as a hack to get Hadoop to run a mapper.
> This no longer works with Hadoop23, causing this test to fail. Note that this
> tests empty partitions.
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