fix rocksdb memory statistics

[kidleaf-jiang]

No description provided.

[codecov]

Codecov Report

Merging #937 into master will decrease coverage by 8.30%.
The diff coverage is 59.15%.

@@             Coverage Diff              @@
##             master     #937      +/-   ##
============================================
- Coverage     71.16%   62.85%   -8.31%     
+ Complexity     4358     3937     -421     
============================================
  Files           283      298      +15     
  Lines         20967    22317    +1350     
  Branches       2959     3157     +198     
============================================
- Hits          14921    14028     -893     
- Misses         4566     6755    +2189     
- Partials       1480     1534      +54     

Impacted Files	Coverage Δ	Complexity Δ
...api/src/main/java/com/baidu/hugegraph/api/API.java	66.29% <0.00%> (+5.37%)	0.00 <0.00> (ø)
.../hugegraph/api/traversers/AllShortestPathsAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...baidu/hugegraph/api/traversers/CrosspointsAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ugegraph/api/traversers/FusiformSimilarityAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...hugegraph/api/traversers/JaccardSimilarityAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...a/com/baidu/hugegraph/api/traversers/PathsAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...va/com/baidu/hugegraph/api/traversers/RaysAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...a/com/baidu/hugegraph/api/traversers/RingsAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...idu/hugegraph/api/traversers/SameNeighborsAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ph/api/traversers/SingleSourceShortestPathAPI.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
... and 271 more

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