[jira] Assigned: (HIVE-1115) optimize combinehiveinputformat in presence of many partitions

["Namit Jain (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-1115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Namit Jain reassigned HIVE-1115:
--------------------------------

    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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