[jira] [Commented] (HIVE-9490) [Parquet] Support Alter Table/Partition Concatenate

["Emanuele Cesena (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-9490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15394725#comment-15394725 ] 

Emanuele Cesena commented on HIVE-9490:
---------------------------------------

Any update on this?

> [Parquet] Support Alter Table/Partition Concatenate
> ---------------------------------------------------
>
>                 Key: HIVE-9490
>                 URL: https://issues.apache.org/jira/browse/HIVE-9490
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Dong Chen
>            Assignee: Dong Chen
>         Attachments: HIVE-9490.patch-testcase
>
>
> Parquet should support 
> {{ALTER TABLE table_name \[PARTITION (partition_key = 'partition_value')\] CONCATENATE;}}
> If the table or partition contains many small Parquet files, then the above command will merge them into larger files. The merge should happen at row group level thereby avoiding the overhead of decompressing and decoding the data. 
> It is only supported by RCFiles or ORCFiles now.



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