mzabaluev commented on code in PR #9237:
URL: https://github.com/apache/arrow-rs/pull/9237#discussion_r2712169035
##########
arrow-avro/src/codec.rs:
##########
@@ -1529,23 +1529,77 @@ impl<'a> Maker<'a> {
Ok(dt)
}
(writer_non_union, Schema::Union(reader_variants)) => {
- let promo = self.find_best_promotion(
- writer_non_union,
- reader_variants.as_slice(),
- namespace,
- );
- let Some((reader_index, promotion)) = promo else {
- return Err(ArrowError::SchemaError(
- "Writer schema does not match any reader union
branch".to_string(),
- ));
- };
- let mut dt = self.parse_type(reader_schema, namespace)?;
- dt.resolution = Some(ResolutionInfo::Union(ResolvedUnion {
- writer_to_reader: Arc::from(vec![Some((reader_index,
promotion))]),
- writer_is_union: false,
- reader_is_union: true,
- }));
- Ok(dt)
+ let null_position = reader_variants
+ .iter()
+ .position(|x| x ==
&Schema::TypeName(TypeName::Primitive(PrimitiveType::Null)));
+ if let (2, Some(null_idx)) = (reader_variants.len(),
null_position) {
+ let non_null_idx = 1 - null_idx;
+ let non_null_branch = &reader_variants[non_null_idx];
+ let mut dt =
+ self.make_data_type(writer_non_union,
Some(non_null_branch), namespace)?;
Review Comment:
I'd call `resolve_type` directly here because that's what it always amounts
to.
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