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https://issues.apache.org/jira/browse/HIVE-12994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15173042#comment-15173042
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Ashutosh Chauhan commented on HIVE-12994:
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Compile side changes look good to me. [~gopalv] Can you help review runtime
changes ?
> Implement support for NULLS FIRST/NULLS LAST
> --------------------------------------------
>
> Key: HIVE-12994
> URL: https://issues.apache.org/jira/browse/HIVE-12994
> Project: Hive
> Issue Type: New Feature
> Components: CBO, Parser, Serializers/Deserializers
> Affects Versions: 2.1.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-12994.01.patch, HIVE-12994.02.patch,
> HIVE-12994.03.patch, HIVE-12994.04.patch, HIVE-12994.05.patch,
> HIVE-12994.06.patch, HIVE-12994.06.patch, HIVE-12994.07.patch,
> HIVE-12994.08.patch, HIVE-12994.09.patch, HIVE-12994.10.patch,
> HIVE-12994.11.patch, HIVE-12994.patch
>
>
> From SQL:2003, the NULLS FIRST and NULLS LAST options can be used to
> determine whether nulls appear before or after non-null data values when the
> ORDER BY clause is used.
> SQL standard does not specify the behavior by default. Currently in Hive,
> null values sort as if lower than any non-null value; that is, NULLS FIRST is
> the default for ASC order, and NULLS LAST for DESC order.
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