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| author | Xin Wu <xinwu@us.ibm.com> | 2016-09-14 21:14:29 +0200 |
|---|---|---|
| committer | Herman van Hovell <hvanhovell@databricks.com> | 2016-09-14 21:14:29 +0200 |
| commit | 040e46979d5f90edc7f9be3cbedd87e8986e8053 (patch) | |
| tree | 65b9ac14a2ddf54a1f0e8d3c251645fb4ea23273 /sql/catalyst/pom.xml | |
| parent | a79838bdeeb12cec4d50da3948bd8a33777e53a6 (diff) | |
| download | spark-040e46979d5f90edc7f9be3cbedd87e8986e8053.tar.gz spark-040e46979d5f90edc7f9be3cbedd87e8986e8053.tar.bz2 spark-040e46979d5f90edc7f9be3cbedd87e8986e8053.zip | |
[SPARK-10747][SQL] Support NULLS FIRST|LAST clause in ORDER BY
## What changes were proposed in this pull request?
Currently, ORDER BY clause returns nulls value according to sorting order (ASC|DESC), considering null value is always smaller than non-null values.
However, SQL2003 standard support NULLS FIRST or NULLS LAST to allow users to specify whether null values should be returned first or last, regardless of sorting order (ASC|DESC).
This PR is to support this new feature.
## How was this patch tested?
New test cases are added to test NULLS FIRST|LAST for regular select queries and windowing queries.
(If this patch involves UI changes, please attach a screenshot; otherwise, remove this)
Author: Xin Wu <xinwu@us.ibm.com>
Closes #14842 from xwu0226/SPARK-10747.
Diffstat (limited to 'sql/catalyst/pom.xml')
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