mzabaluev commented on issue #9231:
URL: https://github.com/apache/arrow-rs/issues/9231#issuecomment-3777448415
The inner element type gets resolved to this codec instance, which seems
correct for decoding non-nullable elements:
```
AvroDataType {
nullability: Some(
NullFirst,
),
metadata: {},
codec: Int32,
resolution: Some(
Union(
ResolvedUnion {
writer_to_reader: [
Some(
(
1,
Direct,
),
),
],
writer_is_union: false,
reader_is_union: true,
},
),
),
}
```
But when the array type codec is constructed, the resolution information on
the element type is lost:
```
AvroDataType {
nullability: Some(
NullFirst,
),
metadata: {},
codec: List(
AvroDataType {
nullability: Some(
NullFirst,
),
metadata: {},
codec: Int32,
resolution: None,
},
),
resolution: Some(
Union(
ResolvedUnion {
writer_to_reader: [
Some(
(
1,
Direct,
),
),
],
writer_is_union: false,
reader_is_union: true,
},
),
),
}
```
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