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From "Emanuele Cesena (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HIVE-9490) [Parquet] Support Alter Table/Partition Concatenate
Date Tue, 26 Jul 2016 23:02:20 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15394725#comment-15394725
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Emanuele Cesena edited comment on HIVE-9490 at 7/26/16 11:01 PM:
-----------------------------------------------------------------

Any update on this? Thanks!


was (Author: ecesena):
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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