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From "Ashish Thusoo (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-222) Group by on a combination of disitinct and non distinct aggregates can return serialization errors with map side aggregations.
Date Sat, 10 Jan 2009 15:25:59 GMT

     [ https://issues.apache.org/jira/browse/HIVE-222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashish Thusoo updated HIVE-222:
-------------------------------

             Priority: Blocker  (was: Major)
    Affects Version/s: 0.2.0
        Fix Version/s: 0.2.0

> 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
>
>
> 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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