[jira] [Assigned] (SPARK-10216) Avoid creating empty files during overwrite into Hive table with group by query

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-10216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-10216:
------------------------------------

    Assignee:     (was: Apache Spark)

> Avoid creating empty files during overwrite into Hive table with group by query
> -------------------------------------------------------------------------------
>
>                 Key: SPARK-10216
>                 URL: https://issues.apache.org/jira/browse/SPARK-10216
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Keuntae Park
>            Priority: Minor
>
> Exchange from GROUP BY query results in at least certain amount of partitions specified in 'spark.sql.shuffle.partition'.
> Hence, even when the number of distinct group-by key is small, 
> INSERT INTO with GROUP BY query try to make at least 200 files (default value of 'spark.sql.shuffle.partition'), 
> which results in lots of empty files.
> I think it is undesirable because upcoming queries on the resulting table will also make zero size partitions and unnecessary tasks do nothing on handling the queries.



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