GitHub user xuchuanyin opened a pull request:

    https://github.com/apache/carbondata/pull/1678

    [CARBONDATA-1903] optimize code in carbondata

    Be sure to do all of the following checklist to help us incorporate 
    your contribution quickly and easily:
    
     - [x] Any interfaces changed?
        `No`
     - [x] Any backward compatibility impacted?
        `No`
     - [x] Document update required?
        `No`
     - [x] Testing done
            Please provide details on 
            - Whether new unit test cases have been added or why no new tests 
are required?
            `No, only fixed code related issues.`
            - How it is tested? Please attach test report.
            `Tested in local machine`
            - Is it a performance related change? Please attach the performance 
test report.
            `No, only fixed code related issues.`
            - Any additional information to help reviewers in testing this 
change.
            `No`
           
     - [x] For large changes, please consider breaking it into sub-tasks under 
an umbrella JIRA. 
            `Not related`
    
    Modification
    ===
    
    1. Remove unused code like `FileUtil`
    
    2. Fix/Optimize code issues in carbondata

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/xuchuanyin/carbondata opt_useless_code

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/carbondata/pull/1678.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 #1678
    
----
commit 5e5a7068c51532349503602c698e77da857a71b5
Author: xuchuanyin <[email protected]>
Date:   2017-12-19T08:40:49Z

    optimize code in carbondata
    
    1. Remove unused code like `FileUtil`
    
    2. Fix/Optimize code issues in carbondata

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