GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/8159
[SPARK-9929][SQL] support metadata in withColumn
in MLlib sometimes we need to set metadata for the new column, thus we will
alias the new column with metadata before call `withColumn` and in `withColumn`
we alias this clolumn again. Here I overloaded `withColumn` to allow user set
metadata, just like what we did for `Column.as`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark withColumn
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8159.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 #8159
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commit 4698d05db5e874cc6cb7aa3dced022809bf3ba3d
Author: Wenchen Fan <cloud0...@outlook.com>
Date: 2015-08-13T04:24:42Z
support metadata in withColumn
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