small perf improve

[javeme]

Change-Id: I10531dad2acedbf2efb598ccc3d99c169b52ebaa

[codecov]

Codecov Report

Merging #1053 into master will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1053      +/-   ##
============================================
- Coverage     69.17%   69.15%   -0.03%     
- Complexity     5444     5445       +1     
============================================
  Files           329      329              
  Lines         26424    26426       +2     
  Branches       3776     3776              
============================================
- Hits          18279    18275       -4     
- Misses         6361     6366       +5     
- Partials       1784     1785       +1     

Impacted Files	Coverage Δ	Complexity Δ
...a/com/baidu/hugegraph/backend/query/Condition.java	77.65% <100.00%> (-0.29%)	32.00 <0.00> (ø)
.../java/com/baidu/hugegraph/util/StringEncoding.java	84.41% <100.00%> (+1.08%)	27.00 <3.00> (+1.00)
...raph/backend/store/rocksdb/RocksDBStdSessions.java	69.75% <100.00%> (-0.28%)	30.00 <0.00> (ø)
...om/baidu/hugegraph/api/filter/ExceptionFilter.java	64.28% <0.00%> (-4.09%)	0.00% <0.00%> (ø%)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	79.73% <0.00%> (-0.12%)	192.00% <0.00%> (ø%)

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