GitHub user wangyum opened a pull request:
https://github.com/apache/spark/pull/21479
[SPARK-23903][SQL] Add support for date extract
## What changes were proposed in this pull request?
Add support for date `extract`, supported field same as
[Hive](https://github.com/apache/hive/blob/rel/release-2.3.3/ql/src/java/org/apache/hadoop/hive/ql/parse/IdentifiersParser.g#L308-L316):
`YEAR`, `QUARTER`, `MONTH`, `WEEK`, `DAY`, `HOUR`, `MINUTE`, `SECOND`.
## How was this patch tested?
unit tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wangyum/spark SPARK-23903
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21479.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #21479
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commit a1a4db3774e7e0911e710ed1a99694add29df545
Author: Yuming Wang <yumwang@...>
Date: 2018-06-01T16:06:55Z
Add support for date extract
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