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https://issues.apache.org/jira/browse/HIVE-1115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Namit Jain reassigned HIVE-1115:
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Assignee: Namit Jain
> optimize combinehiveinputformat in presence of many partitions
> --------------------------------------------------------------
>
> Key: HIVE-1115
> URL: https://issues.apache.org/jira/browse/HIVE-1115
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Namit Jain
>
> A query like :
> select .. from T where ...
> where T contains a very large number of partitions does not work very well
> with CombineHiveInputFomat.
> A pool is created per directory, which leads to a high number of mappers.
> In case all partitions share the same operator tree, and the same partition
> description, only a single pool should be created.
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