liurenjie1024 commented on issue #417:
URL: https://github.com/apache/iceberg-rust/issues/417#issuecomment-2533708338

   Hi, @feniljain I also didn't find how distinct counts are implemented in 
java, but according to the spec it's supposed to be an estimated value using 
sketch. I think we could start with nan values and ignore distinct counts first.
   
   > Map from column id to number of distinct values in the column; distinct 
counts must be derived using values in the file by counting or using sketches, 
but not using methods like merging existing distinct counts


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