refactor: improve rocksdb code

[jadepeng]

No description provided.

[codecov]

Codecov Report

Merging #2002 (40a30f1) into master (19ef0ac) will decrease coverage by 0.01%.
The diff coverage is 80.95%.

@@             Coverage Diff              @@
##             master    #2002      +/-   ##
============================================
- Coverage     70.50%   70.49%   -0.02%     
+ Complexity      724      677      -47     
============================================
  Files           453      453              
  Lines         39024    39024              
  Branches       5556     5556              
============================================
- Hits          27515    27511       -4     
- Misses         8810     8815       +5     
+ Partials       2699     2698       -1     

Impacted Files	Coverage Δ
.../hugegraph/backend/store/rocksdb/RocksDBTable.java	67.11% <ø> (ø)
...hugegraph/backend/store/rocksdb/RocksDBTables.java	74.44% <0.00%> (ø)
...h/backend/store/rocksdbsst/RocksDBSstSessions.java	47.65% <ø> (ø)
.../hugegraph/backend/store/rocksdb/RocksDBStore.java	73.46% <78.57%> (-0.05%)	⬇️
...hugegraph/backend/serializer/BinarySerializer.java	85.58% <100.00%> (+0.02%)	⬆️
...raph/backend/store/rocksdb/RocksDBStdSessions.java	75.64% <100.00%> (ø)
...va/com/baidu/hugegraph/util/collection/IntMap.java	72.80% <0.00%> (-1.21%)	⬇️
...aidu/hugegraph/backend/store/hbase/HbaseTable.java	76.36% <0.00%> (-0.61%)	⬇️

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[imbajin]

could handle/fix it