spark git commit: [SPARK-20600][SS] KafkaRelation should be pretty printed in web UI

[zsxwing]

Repository: spark
Updated Branches:
  refs/heads/branch-2.2 dd9e3b2c9 -> 5844151bc


[SPARK-20600][SS] KafkaRelation should be pretty printed in web UI

## What changes were proposed in this pull request?

User-friendly name of `KafkaRelation` in web UI (under Details for Query).

### Before

<img width="516" alt="spark-20600-before" 
src="https://cloud.githubusercontent.com/assets/62313/25841955/74479ac6-34a2-11e7-87fb-d9f62a1356a7.png";>

### After

<img width="439" alt="spark-20600-after" 
src="https://cloud.githubusercontent.com/assets/62313/25841829/f5335630-34a1-11e7-85a4-afe9b66d73c8.png";>

## How was this patch tested?

Local build

```
./bin/spark-shell --jars 
~/.m2/repository/org/apache/spark/spark-sql-kafka-0-10_2.11/2.3.0-SNAPSHOT/spark-sql-kafka-0-10_2.11-2.3.0-SNAPSHOT.jar
 --packages org.apache.kafka:kafka-clients:0.10.0.1
```

Author: Jacek Laskowski <ja...@japila.pl>

Closes #17917 from jaceklaskowski/SPARK-20600-KafkaRelation-webUI.

(cherry picked from commit 7144b51809aa99ac076786c369389e2330142beb)
Signed-off-by: Shixiong Zhu <shixi...@databricks.com>


Project: http://git-wip-us.apache.org/repos/asf/spark/repo
Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/5844151b
Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/5844151b
Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/5844151b

Branch: refs/heads/branch-2.2
Commit: 5844151bc8e410e7d5b48990bfc9d3c55926f56f
Parents: dd9e3b2
Author: Jacek Laskowski <ja...@japila.pl>
Authored: Thu May 11 10:55:11 2017 -0700
Committer: Shixiong Zhu <shixi...@databricks.com>
Committed: Thu May 11 10:55:31 2017 -0700

----------------------------------------------------------------------
 .../main/scala/org/apache/spark/sql/kafka010/KafkaRelation.scala  | 3 +++
 1 file changed, 3 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/spark/blob/5844151b/external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaRelation.scala
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diff --git 
a/external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaRelation.scala
 
b/external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaRelation.scala
index 97bd283..7103709 100644
--- 
a/external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaRelation.scala
+++ 
b/external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaRelation.scala
@@ -143,4 +143,7 @@ private[kafka010] class KafkaRelation(
         validateTopicPartitions(partitions, partitionOffsets)
     }
   }
+
+  override def toString: String =
+    s"KafkaRelation(strategy=$strategy, start=$startingOffsets, 
end=$endingOffsets)"
 }


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