jecsand838 commented on code in PR #8006:
URL: https://github.com/apache/arrow-rs/pull/8006#discussion_r2234676478
##########
arrow-avro/src/reader/mod.rs:
##########
@@ -116,88 +129,295 @@ fn read_header<R: BufRead>(mut reader: R) ->
Result<Header, ArrowError> {
break;
}
}
- decoder.flush().ok_or_else(|| {
- ArrowError::ParseError("Unexpected EOF while reading Avro
header".to_string())
- })
+ decoder
+ .flush()
+ .ok_or_else(|| ArrowError::ParseError("Unexpected EOF while reading
Avro header".into()))
}
/// A low-level interface for decoding Avro-encoded bytes into Arrow
`RecordBatch`.
+///
+/// This decoder handles both standard Avro container file data and
single-object encoded
+/// messages by managing schema resolution and caching decoders.
#[derive(Debug)]
pub struct Decoder {
- record_decoder: RecordDecoder,
+ /// The maximum number of rows to decode into a single batch.
batch_size: usize,
+ /// The number of rows decoded into the current batch.
decoded_rows: usize,
+ /// The fingerprint of the active writer schema.
+ active_fp: Option<Fingerprint>,
+ /// The `RecordDecoder` corresponding to the active writer schema.
+ active_decoder: RecordDecoder,
+ /// An LRU cache of inactive `RecordDecoder`s, keyed by schema fingerprint.
+ cache: HashMap<Fingerprint, RecordDecoder>,
Review Comment:
I pushed up the `IndexMap` changes. Thank you again for that one.
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