GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/20146
[SPARK-11215][ML] Add multiple columns support to StringIndexer
## What changes were proposed in this pull request?
This takes over #19621 to add multi-column support to StringIndexer.
## How was this patch tested?
Added tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 SPARK-11215
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20146.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 #20146
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commit bb990f1a6511d8ce20f4fff254dfe0ff43262a10
Author: Liang-Chi Hsieh <viirya@...>
Date: 2018-01-03T03:51:59Z
Add multi-column support to StringIndexer.
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