alamb commented on code in PR #9470:
URL: https://github.com/apache/arrow-rs/pull/9470#discussion_r2961947027


##########
arrow-schema/src/field.rs:
##########
@@ -30,6 +30,9 @@ use crate::{
     extension::{EXTENSION_TYPE_METADATA_KEY, EXTENSION_TYPE_NAME_KEY, 
ExtensionType},
 };
 
+/// The metadata key for the Parquet field id of a [`Field`].

Review Comment:
   My one concern is that this now has a parquet specific implementation detail 
in the arrow crate 🤔 
   
   The dependency until now has been the other way around.
   
   Maybe we could add this function as a `ParquetFieldExt` trait in the Parquet 
crate so we could keep the parquet specific logic in that crate rather than in 
arrow?



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