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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-61) Implment ORDER BY
Date Fri, 14 Nov 2008 00:32:44 GMT

    [ https://issues.apache.org/jira/browse/HIVE-61?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647484#action_12647484
] 

Zheng Shao commented on HIVE-61:
--------------------------------

Some more details about the implementation of ORDER BY:

We will store on what columns a table (or a partition) is partitioned, and sorted (in asc/desc
order), right after we insert data into that table. We will also store whether the table is
ordered or not.

If a table/partition is ordered and if we do a select (that outputs the data to console) from
that table, then we will need to merge-sort all files in that table/partition based on the
sort order.



> Implment ORDER BY
> -----------------
>
>                 Key: HIVE-61
>                 URL: https://issues.apache.org/jira/browse/HIVE-61
>             Project: Hadoop Hive
>          Issue Type: New Feature
>            Reporter: Jeff Hammerbacher
>
> ORDER BY is in the query language reference but currently is a no-op. We should make
it an op.

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