REASY commented on issue #4973:
URL: https://github.com/apache/arrow-rs/issues/4973#issuecomment-1774066454

   Let me try your suggestion, @tustvold, thank you!
   
   Meanwhile, debugging points me to 
https://github.com/apache/arrow-rs/blob/1d6feeacebb8d0d659d493b783ba381940973745/parquet/src/column/writer/mod.rs#L680-L685
 that accumulates stats every time a new page is created 
https://github.com/apache/arrow-rs/blob/1d6feeacebb8d0d659d493b783ba381940973745/parquet/src/column/writer/mod.rs#L745
   
   In case if I write 1000 rows, 100 rows per group I see it is a vec<vec<>> 
with 50 elements:
   
![image](https://github.com/apache/arrow-rs/assets/5107562/c8cabff3-2363-409c-a3c4-a380a1b78085)
   


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