GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/14181
[SPARK-15382][SQL] Fix a rule to push down projects beneath Sample
## What changes were proposed in this pull request?
When `X` > 1.0 in `Dataset#sample`, `sample(true, X).withColumn("x",
monotonically_increasing_id)` cannot have unique ids. This pr fixes this bug.
## How was this patch tested?
Added tests in `DataFrameSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark SPARK-15382
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14181.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 #14181
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commit 9a5f975c5d96ebff0afca6634dffa1ced5623a0e
Author: Takeshi YAMAMURO <linguin....@gmail.com>
Date: 2016-07-13T04:29:55Z
Add a role to avoid incorrect push-downs
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