mzabaluev commented on code in PR #9328:
URL: https://github.com/apache/arrow-rs/pull/9328#discussion_r2786493177
##########
arrow-avro/src/codec.rs:
##########
@@ -1533,62 +1550,35 @@ impl<'a> Maker<'a> {
nullable_union_variants(reader_variants)
{
let mut dt = self.resolve_type(writer_non_union,
non_null_branch, namespace)?;
- let non_null_idx = match nullability {
- Nullability::NullFirst => 1,
- Nullability::NullSecond => 0,
- };
#[cfg(feature = "avro_custom_types")]
Self::propagate_nullability_into_ree(&mut dt, nullability);
dt.nullability = Some(nullability);
- let promotion = Self::coercion_from(&dt);
- dt.resolution = Some(ResolutionInfo::Union(ResolvedUnion {
- writer_to_reader: Arc::from(vec![Some((non_null_idx,
promotion))]),
- writer_is_union: false,
- reader_is_union: true,
- }));
+ // Ensure resolution is set to a non-Union variant to
suppress
+ // reading the union tag which is the default behavior.
+ if dt.resolution.is_none() {
+ dt.resolution =
Some(ResolutionInfo::Promotion(Promotion::Direct));
+ }
Ok(dt)
} else {
- let mut best_match: Option<(usize, AvroDataType,
Promotion)> = None;
- for (i, variant) in reader_variants.iter().enumerate() {
- if let Ok(resolved_dt) =
- self.resolve_type(writer_non_union, variant,
namespace)
- {
- let promotion = Self::coercion_from(&resolved_dt);
- if promotion == Promotion::Direct {
- best_match = Some((i, resolved_dt, promotion));
- break;
- } else if best_match.is_none() {
- best_match = Some((i, resolved_dt, promotion));
- }
- }
- }
- let Some((match_idx, match_dt, promotion)) = best_match
else {
+ let Some((match_idx, resolution)) =
+ self.find_best_union_match(writer_non_union,
reader_variants, namespace)
+ else {
return Err(ArrowError::SchemaError(
"Writer schema does not match any reader union
branch".to_string(),
));
};
- let mut children =
Vec::with_capacity(reader_variants.len());
- let mut match_dt = Some(match_dt);
- for (i, variant) in reader_variants.iter().enumerate() {
- if i == match_idx {
- if let Some(mut dt) = match_dt.take() {
- if matches!(dt.resolution,
Some(ResolutionInfo::Promotion(_))) {
- dt.resolution = None;
- }
- children.push(dt);
- }
- } else {
- children.push(self.parse_type(variant,
namespace)?);
- }
- }
+ let children = reader_variants
+ .iter()
+ .map(|variant| self.parse_type(variant, namespace))
+ .collect::<Result<Vec<_>, _>>()?;
Review Comment:
While default values are a property of record fields, other nested
resolutions are particular for each writer-to-reader resolution case. If the
writer schema is a union with multiple branches resolving to the same reader
branch, fields in any nested records may need to be resolved differently
depending on the branch encoded.
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