Takeshi Yamamuro comments

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                                            Takeshi Yamamuro

Implement Spark Native UDF interface

yea, I think it's a good idea. I'll try later.

Implement general Parameter Server

There is the ticket [SPARK-6932](https://issues.apache.org/jira/browse/SPARK-6932) for parameter servers in the Spark JIRA. Already closed though, there are many valuable discussions and materials there.

Implement general Parameter Server

There are some existing OSS parameter servers; - [dmlc parameter server](https://github.com/dmlc/parameter_server) ([MXNet](https://github.com/dmlc/mxnet) uses this implementation) - [petuum](http://www.petuum.com/) - [TernsorFlow](https://github.com/tensorflow/tensorflow) internal parameter server Other OSS implementations?

Add checkstyle at compile time

thanks for your work. Is this test failure expected? ``` [WARNING] Error injecting: org.apache.maven.plugin.checkstyle.CheckstyleViolationCheckMojo java.lang.UnsupportedClassVersionError: com/puppycrawl/tools/checkstyle/api/CheckstyleException : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) ```

Add checkstyle at compile time

The related topic is #215. Could you let us know the hadoop policy of check styles?

Add checkstyle at compile time

okay, thanks.

Add checkstyle at compile time

I think we need to at least turn off check-style warning logs for `travis-ci` because too long logs possibly cause test failures: https://github.com/travis-ci/travis-ci/issues/3865

Add checkstyle at compile time

cc: @myui

[HIVEMALL-182][SPARK][WIP] Add an optimizer rule to filter out columns with low variances

I'll fix later.

[HIVEMALL-182][SPARK][WIP] Add an optimizer rule to filter out columns with low variances

Sorry for my slow work. I'm checking the feasibility on my separate repo (because there are some issues to solve): https://github.com/maropu/spark-catalyst-rule-rewiter/tree/master So, please give me more time and thanks.