scovich commented on code in PR #8006:
URL: https://github.com/apache/arrow-rs/pull/8006#discussion_r2252769379


##########
arrow-avro/src/reader/mod.rs:
##########
@@ -124,23 +132,26 @@ fn read_header<R: BufRead>(mut reader: R) -> 
Result<Header, ArrowError> {
 /// A low-level interface for decoding Avro-encoded bytes into Arrow 
`RecordBatch`.
 #[derive(Debug)]
 pub struct Decoder {
-    record_decoder: RecordDecoder,
+    active_decoder: RecordDecoder,
+    active_fingerprint: Option<Fingerprint>,
     batch_size: usize,
-    decoded_rows: usize,
+    remaining_capacity: usize,
+    #[cfg(feature = "lru")]
+    cache: LruCache<Fingerprint, RecordDecoder>,
+    #[cfg(not(feature = "lru"))]
+    cache: IndexMap<Fingerprint, RecordDecoder>,
+    max_cache_size: usize,
+    reader_schema: Option<AvroSchema<'static>>,
+    writer_schema_store: Option<SchemaStore<'static>>,

Review Comment:
   The unit tests don't create any schemas with `TypeName::Ref` -- only 
`TypeName::Primitive` -- and the `Attributes` all use string constants. But 
what if the read schema were user input (i.e. parsed from JSON) and then fed to 
a decoder?



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