samuelcolvin commented on code in PR #6218:
URL: https://github.com/apache/arrow-rs/pull/6218#discussion_r1711387982
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arrow-array/src/array/union_array.rs:
##########
@@ -241,6 +241,27 @@ impl UnionArray {
boxed.as_ref().expect("invalid type id")
}
+ /// Get a member of the union as an array, this is equivalent to
[`self::child`] for sparse unions.
+ ///
+ /// # Panics
+ /// Panics if `type_id` is not present in the union.
+ pub fn member_array(&self, type_id: i8) -> &ArrayRef {
+ let child = self.child(type_id);
+ match &self.offsets {
+ Some(_offsets) => {
+ todo!("I'm not sure what to do here");
Review Comment:
@alamb I couldn't work out how to do this since we don't know the type of
`child` here so we can't downcast.
Any help much appreciate.
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