Using croaring library instead of MaskCollection #4356
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Description
Using croaring library instead of MaskCollection, and using new mask in NodeGroup::scan.
This improves performance by roughly 60% QPS in twitter2010,query like 'match (a:vertex)-[f]-(b) where a.ID=3961 return b'.
In SF100,single query like 'match (a:person {id:24189255912498})-[f*2]-(b) return distinct b limit 20' improve 35%
However,more performance testing is needed.
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