remove useless import and var by wupengfei2 · Pull Request #585 · apache/hugegraph

@@             Coverage Diff             @@
##             master     #585     +/-   ##
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- Coverage     70.38%   69.58%   -0.8%     
+ Complexity     3450     3415     -35     
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  Files           216      216             
  Lines         16535    16535             
  Branches       2355     2355             
===========================================
- Hits          11638    11506    -132     
- Misses         3653     3787    +134     
+ Partials       1244     1242      -2