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From "Prasanth J (JIRA)" <>
Subject [jira] [Commented] (HIVE-6883) Dynamic partitioning optimization does not honor sort order or order by
Date Fri, 19 Sep 2014 02:31:34 GMT


Prasanth J commented on HIVE-6883:

[~wzc1989] The fix needs more revision wrt subqueries. Currently it doesn't preserve the ordering
of records if any subqueries has order by. I am working on it and will post an update to that

> Dynamic partitioning optimization does not honor sort order or order by
> -----------------------------------------------------------------------
>                 Key: HIVE-6883
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.13.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>            Priority: Critical
>             Fix For: 0.14.0, 0.13.1
>         Attachments: HIVE-6883-branch-0.13.3.patch, HIVE-6883.1.patch, HIVE-6883.2.patch,
> HIVE-6455 patch does not honor sort order of the output table or order by of select statement.
The reason for the former is numDistributionKey in ReduceSinkDesc is set wrongly. It doesn't
take into account the sort columns, because of this RSOp sets the sort columns to null in
Key. Since nulls are set in place of sort columns in Key, the sort columns in Value are not
> The other issue is ORDER BY columns are not honored during insertion. For example
> {code}
> insert overwrite table over1k_part_orc partition(ds="foo", t) select si,i,b,f,t from
over1k_orc where t is null or t=27 order by si;
> {code}
> the select query performs order by on column 'si' in the first MR job. The following
MR job (inserted by HIVE-6455), sorts the input data on dynamic partition column 't' without
taking into account the already sorted 'si' column. This results in out of order insertion
for 'si' column.

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