tustvold commented on code in PR #4902:
URL: https://github.com/apache/arrow-rs/pull/4902#discussion_r1350130538
##########
arrow-schema/src/field.rs:
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@@ -494,7 +497,9 @@ impl Field {
| DataType::LargeUtf8
| DataType::Decimal128(_, _)
| DataType::Decimal256(_, _) => {
- if self.data_type != from.data_type {
+ if from.data_type == DataType::Null {
Review Comment:
I'm not sure about this change as a NullArray is a physically distinct type
and is therefore not inherently compatible. It "can" be coerced to the same
type, via the cast kernels, but it is not inherently compatible which is the
notion encoded in this method
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