GitHub user liyichao opened a pull request:
https://github.com/apache/spark/pull/18144
[SPARK-20912][SQL] Allow column name in map functions.
## What changes were proposed in this pull request?
`map` function only accepts Column values only. It'd be very helpful to
have a variant that accepts String for columns just like what `array` or
`struct`.
## How was this patch tested?
Added a test in `DataFrameFunctionsSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liyichao/spark SPARK-20912
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18144.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 #18144
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commit 64a98306c6e1e6e9f79a976044c6895779afb24c
Author: Li Yichao <l...@zhihu.com>
Date: 2017-05-30T14:35:28Z
Allow column name in map functions.
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