etseidl commented on code in PR #7372:
URL: https://github.com/apache/arrow-rs/pull/7372#discussion_r2023737422


##########
parquet/src/file/metadata/reader.rs:
##########
@@ -710,7 +710,11 @@ impl ParquetMetaDataReader {
                 ));
             }
 
-            Ok((self.decode_footer_metadata(&meta, &footer)?, None))
+            Ok((
+                // need to slice off the footer or decryption fails
+                self.decode_footer_metadata(&meta.slice(0..length), &footer)?,
+                None,

Review Comment:
   Yes...without this change the added test fails.



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