etseidl commented on code in PR #8111:
URL: https://github.com/apache/arrow-rs/pull/8111#discussion_r2274361792


##########
parquet/src/file/metadata/reader.rs:
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@@ -1102,10 +1218,388 @@ fn get_file_decryptor(
     }
 }
 
+// temp structs used to construct RowGroupMetaData

Review Comment:
   See above about `FileMetaData` 😄 
   
   I actually went down that road and it was slower. :( That may have been my 
incompetence, or it may be that the code got too bloated and the optimizer gave 
up.



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