Cpaulyz opened a new pull request, #11591:
URL: https://github.com/apache/iotdb/pull/11591

   ## Description
   
   Use HashMap instead of 2D arrays to avoid space occupation in sparse 
matrices. Experiments with `testFetchSchemaPerfomance` demonstrate that 
performance is not affected, but there is a significant reduction in memory 
usage.
   
   Before:
   <img width="1227" alt="image" 
src="https://github.com/apache/iotdb/assets/43774645/e1d4d396-392c-4181-8fa3-dddeb612e318";>
   
   
   After:
   <img width="1175" alt="image" 
src="https://github.com/apache/iotdb/assets/43774645/ec2e2741-9f0b-4306-9ffe-3ff2160e37c6";>
   


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