GitHub user ZiyueHuang opened a pull request:
https://github.com/apache/spark/pull/18272
[DOCS] Fix error: ambiguous reference to overloaded definition
## What changes were proposed in this pull request?
`df.groupBy.count()` should be `df.groupBy().count()` , otherwise there is
an error :
ambiguous reference to overloaded definition, both method groupBy in class
Dataset of type (col1: String, cols: String*) and method groupBy in class
Dataset of type (cols: org.apache.spark.sql.Column*)
## How was this patch tested?
```scala
val df = spark.readStream.schema(...).json(...)
val dfCounts =df.groupBy().count()
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ZiyueHuang/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18272.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 #18272
----
commit 67dd3c75bce72bd320124b3b1a7585af40d18fb2
Author: Ziyue Huang <[email protected]>
Date: 2017-06-12T06:10:09Z
Fix error: ambiguous reference to overloaded definition, both method
groupBy in class Dataset of type (col1: String, cols: String*) and (cols:
org.apache.spark.sql.Column*)
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