optimize query perf

[javeme]

No description provided.

[codecov]

Codecov Report

Merging #1711 (c690070) into master (1d031c5) will increase coverage by 0.00%.
The diff coverage is 59.70%.

@@            Coverage Diff            @@
##             master    #1711   +/-   ##
=========================================
  Coverage     66.91%   66.91%           
- Complexity     7102     7110    +8     
=========================================
  Files           423      423           
  Lines         35528    35590   +62     
  Branches       4944     4959   +15     
=========================================
+ Hits          23773    23815   +42     
- Misses         9365     9376   +11     
- Partials       2390     2399    +9     

Impacted Files	Coverage Δ
...hugegraph/backend/serializer/BinarySerializer.java	85.44% <0.00%> (ø)
.../hugegraph/backend/serializer/TableSerializer.java	87.60% <0.00%> (ø)
...om/baidu/hugegraph/backend/store/BackendTable.java	84.66% <0.00%> (ø)
...u/hugegraph/traversal/optimize/HugeVertexStep.java	75.00% <0.00%> (ø)
...hugegraph/backend/store/rocksdb/RocksDBTables.java	74.37% <0.00%> (ø)
...om/baidu/hugegraph/backend/query/QueryResults.java	61.98% <6.66%> (-8.11%)	⬇️
...u/hugegraph/backend/tx/SchemaIndexTransaction.java	79.54% <25.00%> (ø)
.../java/com/baidu/hugegraph/api/graph/VertexAPI.java	35.46% <50.00%> (+0.09%)	⬆️
...om/baidu/hugegraph/backend/store/ram/RamTable.java	66.77% <50.00%> (ø)
.../hugegraph/backend/store/rocksdb/RocksDBTable.java	67.83% <50.00%> (-0.26%)	⬇️
... and 21 more

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