martin-g commented on a change in pull request #1396:
URL: https://github.com/apache/avro/pull/1396#discussion_r781171826
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File path: lang/rust/src/types.rs
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@@ -66,7 +66,12 @@ pub enum Value {
/// reading values.
Enum(i32, String),
/// An `union` Avro value.
- Union(Box<Value>),
+ ///
+ /// A Union is represented by the value it holds and its position in the
type list
+ /// of its corresponding schema
+ /// This allows schema-less encoding, as well as schema resolution while
+ /// reading values.
+ Union(i32, Box<Value>),
Review comment:
Why `i32` ? Could we have negative values ?
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