fix g.V().hasLabel().limit(n) lose some results due to overridden index by javeme · Pull Request #1316 · apache/hugegraph

@@             Coverage Diff              @@
##             master    #1316      +/-   ##
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+ Coverage     61.67%   62.35%   +0.67%     
- Complexity     5752     5771      +19     
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  Files           377      377              
  Lines         31501    31525      +24     
  Branches       4413     4417       +4     
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+ Hits          19428    19657     +229     
+ Misses        10088     9873     -215     
- Partials       1985     1995      +10