GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/15724
[SPARK-18216][SQL] Make Column.expr public
## What changes were proposed in this pull request?
Column.expr is private[sql], but it's an actually really useful field to
have for debugging. We should open it up, similar to how we use QueryExecution.
## How was this patch tested?
N/A - this is a simple visibility change.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark SPARK-18216
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15724.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 #15724
commit bbf1d10f2d82f5bfad995c6ad9872f47b5b7c68c
Author: Reynold Xin
Date: 2016-11-02T00:44:59Z
[SPARK-18216][SQL] Make Column.expr public
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