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https://issues.apache.org/jira/browse/HIVE-222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12664854#action_12664854
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David Phillips commented on HIVE-222:
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Is there any value to adding the testcase from HIVE-215?
> Group by on a combination of disitinct and non distinct aggregates can return
> serialization errors with map side aggregations.
> ------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-222
> URL: https://issues.apache.org/jira/browse/HIVE-222
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.2.0
> Reporter: Ashish Thusoo
> Assignee: Ashish Thusoo
> Priority: Blocker
> Fix For: 0.2.0
>
> Attachments: patch-222.txt
>
>
> For queries of the form (groupby2_map.q in the source)
> SELECT x, count(DISTINCT y), SUM(y) FROM t GROUP BY x
> when map side aggregation is on
> hive.map.aggr=true (This is off by default)
> The following exception can occur:
> [junit] Caused by: java.lang.ClassCastException: java.lang.Long cannot be
> cast to java.lang.Double
> [junit] at
> org.apache.hadoop.hive.serde2.dynamic_type.DynamicSerDeTypeDouble.serialize(DynamicSerDeTypeDouble.java:60)
> [junit] at
> org.apache.hadoop.hive.serde2.dynamic_type.DynamicSerDeFieldList.serialize(DynamicSerDeFieldList.java:235)
> [junit] at
> org.apache.hadoop.hive.serde2.dynamic_type.DynamicSerDeStructBase.serialize(DynamicSerDeStructBase.java:81)
> [junit] at
> org.apache.hadoop.hive.serde2.dynamic_type.DynamicSerDe.serialize(DynamicSerDe.java:174)
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