CRZbulabula commented on pull request #2858:
URL: https://github.com/apache/iotdb/pull/2858#issuecomment-802907934


   > you can try another bitmap implementation 
https://github.com/apache/iotdb/blob/encoding_parallel/server/src/main/java/org/apache/iotdb/db/utils/BitMap.java
   > 
   > compare its performance with BitSet.
   
   I've tried to implement bitmap myself, but the bitset in Java.util is more 
efficient. I'll compare this one tomorrow.


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