GitHub user lw-lin opened a pull request:
https://github.com/apache/spark/pull/12389
[SPARK-14630][Build][Core][SQL][Streaming] Code style: public abstract
methods should have explicit return types
## What changes were proposed in this pull request?
Currently many public abstract methods (in abstract classes as well as
traits) don't declare return types explicitly, such as in
[o.a.s.streaming.dstream.InputDStream](https://github.com/apache/spark/blob/master/streaming/src/main/scala/org/apache/spark/streaming/dstream/InputDStream.scala#L110):
```scala
def start() // should be: def start(): Unit
def stop() // should be: def stop(): Unit
```
These methods exist in core, sql, streaming, and this PR fixes them.
## How was this patch tested?
N/A
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/lw-lin/spark public-abstract-methods
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12389.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 #12389
----
commit b2d36b25eb2cec3c602f42bd18dc504b0dbc3935
Author: Liwei Lin <lwl...@gmail.com>
Date: 2016-04-14T09:36:48Z
fix for cor
commit 60791a1bbdcb48fffcd2dd73e1e943c89dd0bf5a
Author: Liwei Lin <lwl...@gmail.com>
Date: 2016-04-14T09:37:53Z
fix for sql
commit d3d83b046fa9c6da6cf99ecdf3d3b37fead169f9
Author: Liwei Lin <lwl...@gmail.com>
Date: 2016-04-14T09:38:15Z
fix for streaming
----
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