nathaniel-d-ef commented on code in PR #8371:
URL: https://github.com/apache/arrow-rs/pull/8371#discussion_r2359624356


##########
arrow-avro/src/writer/format.rs:
##########
@@ -26,16 +29,29 @@ use std::io::Write;
 /// Format abstraction implemented by each container‐level writer.
 pub trait AvroFormat: Debug + Default {
     /// Write any bytes required at the very beginning of the output stream
+    /// (file header, etc.).
     /// Implementations **must not** write any record data.
     fn start_stream<W: Write>(
         &mut self,
         writer: &mut W,
         schema: &Schema,
         compression: Option<CompressionCodec>,
+        fingerprint_strategy: FingerprintStrategy,

Review Comment:
   Oh good idea. Should be able to store fingerprint including magic (unless 
that's what you meant, haha)



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