GitHub user yaooqinn opened a pull request:
https://github.com/apache/spark/pull/19363
[Minor]Override toString of KeyValueGroupedDataset
## What changes were proposed in this pull request?
#### before
```scala
scala> val words = spark.read.textFile("fREADME.md").flatMap(_.split(" "))
words: org.apache.spark.sql.Dataset[String] = [value: string]
scala> val grouped = words.groupByKey(identity)
grouped: org.apache.spark.sql.KeyValueGroupedDataset[String,String] =
org.apache.spark.sql.KeyValueGroupedDataset@65214862
```
#### after
```scala
scala> val words = spark.read.textFile("README.md").flatMap(_.split(" "))
words: org.apache.spark.sql.Dataset[String] = [value: string]
scala> val grouped = words.groupByKey(identity)
grouped: org.apache.spark.sql.KeyValueGroupedDataset[String,String] = [key:
[value: string], value: [value: string]]
```
## How was this patch tested?
existing ut
cc @gatorsmile @cloud-fan
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yaooqinn/spark minor-dataset-tostring
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19363.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 #19363
----
commit a9b30bd6508421de192d0d44b6bc03afd3e0a792
Author: Kent Yao <yaooq...@hotmail.com>
Date: 2017-09-27T07:54:41Z
override toString of KeyValueGroupedDataset
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