jecsand838 commented on code in PR #8349:
URL: https://github.com/apache/arrow-rs/pull/8349#discussion_r2365857259
##########
arrow-avro/src/reader/record.rs:
##########
@@ -214,6 +254,148 @@ struct EnumResolution {
default_index: i32,
}
+#[derive(Debug, Clone, Copy)]
+enum BranchDispatch {
+ NoMatch,
+ ToReader {
+ reader_idx: usize,
+ promotion: Promotion,
+ },
+}
+
+#[derive(Debug)]
+struct UnionResolution {
+ dispatch: Option<Arc<[BranchDispatch]>>,
+ kind: UnionResolvedKind,
+}
+
+#[derive(Debug)]
+enum UnionResolvedKind {
+ Both {
+ reader_type_codes: Arc<[i8]>,
+ },
+ ToSingle {
+ target: Box<Decoder>,
Review Comment:
That's correct, there's the possibility of infinite type recursion with
`Decoder`. I was planning to come back and attempt to remove the need for
`Box`, but that would also impact `Array`, `Map`, and `Nullable`.
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