jt2594838 opened a new pull request, #14766:
URL: https://github.com/apache/iotdb/pull/14766

   1. TsFileRewriteOverPrecisedI64Scan
   Rewrite Int64 chunks that can be converted to Int32 losslessly.
   
   2. TsFileRewriteSmallRangeI64Scan
   Rewrite Int64 chunks whose ranges are no larger than Int32.MAX_VALUE by 
replacing the value with the difference with the first value in the chunk.
   
   3. TsFileStatisticScan
   It prints:
   a. the number of series of each data type;
   b. the number of Int64 chunks that are over-precised (can be converted to 
Int32 losslessly), just-precised (cannot be converted to Int32 losslessly), 
small range (range not larger than Int32.MAX_VALUE), or large range (range 
larger than Int32.MAX_VALUE);
   c. the number of points of each data type;
   d. the total chunk size of each data type.


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