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https://issues.apache.org/jira/browse/HIVE-7870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14113142#comment-14113142
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Chao commented on HIVE-7870:
----------------------------
There are two issues here:
1. when hive.merge.sparkfiles is turned on,
{{GenSparkUtils::removeUnionOperators}} will add duplicate fileSinks, and then
generate duplicate move/merge tasks for them (Thanks [~nyang] for the
discussion)
2. when hive.optimization.union.remove is turned on, some dependency in the
{{SparkWork}} is lost, and hence the result table only contain partial data. In
MR's {{GenMRFileSink1}}, it checks linked file sink descriptors, and link them
to the same task. The corresponding procedure is lacking in Tez/Spark
implementation.
> Insert overwrite table query does not generate correct task plan
> ----------------------------------------------------------------
>
> Key: HIVE-7870
> URL: https://issues.apache.org/jira/browse/HIVE-7870
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Na Yang
> Assignee: Chao
> Labels: Spark-M1
>
> Insert overwrite table query does not generate correct task plan when
> hive.optimize.union.remove and hive.merge.sparkfiles properties are ON.
> {noformat}
> set hive.optimize.union.remove=true
> set hive.merge.sparkfiles=true
> insert overwrite table outputTbl1
> SELECT * FROM
> (
> select key, 1 as values from inputTbl1
> union all
> select * FROM (
> SELECT key, count(1) as values from inputTbl1 group by key
> UNION ALL
> SELECT key, 2 as values from inputTbl1
> ) a
> )b;
> select * from outputTbl1 order by key, values;
> {noformat}
> query result
> {noformat}
> 1 1
> 1 2
> 2 1
> 2 2
> 3 1
> 3 2
> 7 1
> 7 2
> 8 2
> 8 2
> 8 2
> {noformat}
> expected result:
> {noformat}
> 1 1
> 1 1
> 1 2
> 2 1
> 2 1
> 2 2
> 3 1
> 3 1
> 3 2
> 7 1
> 7 1
> 7 2
> 8 1
> 8 1
> 8 2
> 8 2
> 8 2
> {noformat}
> Move work is not working properly and some data are missing during move.
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