Allow typepromotion from binary to fixed binary

Author: vustef

crates/iceberg/src/arrow/reader.rs

@@ -870,6 +870,10 @@ impl ArrowReader {
                 ) if requested_precision >= file_precision && file_scale == requested_scale => true,
                 // Uuid will be store as Fixed(16) in parquet file, so the read back type will be Fixed(16).
                 (Some(PrimitiveType::Fixed(16)), Some(PrimitiveType::Uuid)) => true,
+                // Some Parquet writers (e.g. Snowflake) store FIXED_LEN_BYTE_ARRAY as
+                // Arrow Binary rather than FixedSizeBinary. Allow Binary -> Fixed(N)
+                // since the underlying bytes are the same.
+                (Some(PrimitiveType::Binary), Some(PrimitiveType::Fixed(_))) => true,
                 _ => false,
             }
         }