cache limit vertex sub-properties size

[javeme]

Change-Id: I32125bcf4c6d57724ba75894e8ee32fff81faa0c

[codecov]

Codecov Report

Merging #942 into master will decrease coverage by 0.00%.
The diff coverage is 70.00%.

@@             Coverage Diff              @@
##             master     #942      +/-   ##
============================================
- Coverage     71.94%   71.93%   -0.01%     
- Complexity     4674     4677       +3     
============================================
  Files           298      298              
  Lines         22322    22330       +8     
  Branches       3159     3162       +3     
============================================
+ Hits          16059    16064       +5     
- Misses         4699     4701       +2     
- Partials       1564     1565       +1     

Impacted Files	Coverage Δ	Complexity Δ
...ugegraph/backend/cache/CachedGraphTransaction.java	91.30% <0.00%> (ø)	32.00 <0.00> (ø)
...ava/com/baidu/hugegraph/structure/HugeElement.java	69.62% <87.50%> (+0.95%)	55.00 <3.00> (+3.00)
...n/java/com/baidu/hugegraph/task/TaskScheduler.java	83.14% <0.00%> (-0.38%)	62.00% <0.00%> (ø%)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	79.45% <0.00%> (-0.13%)	186.00% <0.00%> (ø%)
...a/com/baidu/hugegraph/backend/query/Condition.java	79.25% <0.00%> (ø)	31.00% <0.00%> (ø%)

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