tustvold commented on code in PR #7962:
URL: https://github.com/apache/arrow-datafusion/pull/7962#discussion_r1379202501


##########
datafusion/core/src/datasource/file_format/arrow.rs:
##########
@@ -99,7 +102,177 @@ impl FileFormat for ArrowFormat {
     }
 }
 
-fn read_arrow_schema_from_reader<R: Read + Seek>(reader: R) -> 
Result<SchemaRef> {
-    let reader = FileReader::try_new(reader, None)?;
-    Ok(reader.schema())
+const ARROW_MAGIC: [u8; 6] = [b'A', b'R', b'R', b'O', b'W', b'1'];

Review Comment:
   I think I would rather the approach described on 
https://github.com/apache/arrow-rs/issues/5021, reading the footer is more 
generally useful, providing information beyond just the schema



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