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https://issues.apache.org/jira/browse/HIVE-384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696247#action_12696247
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Zheng Shao commented on HIVE-384:
---------------------------------
It seems that the new test results print out the GroupByOperator after
ReduceOutputOperator in the "Map Operator Tree", while it is already printed
out in the "Reduce Operator Tree:" section.
{code}
+ Reduce Output Operator
+ key expressions:
+ expr: 0
+ type: string
+ sort order: +
+ Map-reduce partition columns:
+ expr: 0
+ type: string
+ tag: -1
+ value expressions:
+ expr: 1
+ type: bigint
+ Group By Operator
+ aggregations:
+ expr: count(VALUE.0)
+ keys:
+ expr: KEY.0
+ type: string
+ mode: mergepartial
+ Select Operator
+ expressions:
+ expr: 0
+ type: string
+ expr: 1
+ type: bigint
+ File Output Operator
+ compressed: false
+ GlobalTableId: 0
+ table:
+ input format:
org.apache.hadoop.mapred.TextInputFormat
+ output format:
org.apache.hadoop.hive.ql.io.IgnoreKeyTextOutputFormat
+ /data/users/njain/hive1/hive/build/ql/tmp/58586108/201879798.10003
{code}
> problem in union if the first subquery is a map-only job
> --------------------------------------------------------
>
> Key: HIVE-384
> URL: https://issues.apache.org/jira/browse/HIVE-384
> Project: Hadoop Hive
> Issue Type: Bug
> Reporter: Namit Jain
> Assignee: Namit Jain
> Priority: Blocker
> Attachments: hive.384.1.patch, hive.384.2.patch, hive.384.3.patch,
> hive.384.4.patch
>
>
> Union needs special handling.
> explain
> select unionsrc.key, count(1) FROM (select s2.key as key, s2.value as value
> from src1 s2
> UNION ALL
> select 'tst1' as key, cast(count(1) as
> string) as value from src s1)
> unionsrc group by unionsrc.key;
> results in a null pointer exception
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