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https://issues.apache.org/jira/browse/HIVE-18445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16332309#comment-16332309
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Zoltan Haindrich commented on HIVE-18445:
-----------------------------------------
oh...I was looking thru things for a few minutes...but eventually I've figured
it out....the groupby is added because HIVE-13567 have enable the colstats
collection which technically an extra aggregator executed on the newly created
table's contents - and because of the aggregation there is a groupby; because
UDAFs has a wider range of function than just aggregate a column; probably most
importantly, the [aggregation
modes|https://github.com/apache/hive/blob/d6c6d96f98d998298618a643bd0d571d4e290dc3/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDAFEvaluator.java#L76].
+1 pending tests
> qtests: auto_join25.q fails permanently
> ---------------------------------------
>
> Key: HIVE-18445
> URL: https://issues.apache.org/jira/browse/HIVE-18445
> Project: Hive
> Issue Type: Bug
> Components: Tests
> Reporter: Laszlo Bodor
> Assignee: Laszlo Bodor
> Priority: Major
> Attachments: HIVE-18445.01.patch
>
>
> org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[auto_join25]
> (batchId=72)
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