pitrou commented on a change in pull request #8343:
URL: https://github.com/apache/arrow/pull/8343#discussion_r499739059
##########
File path: cpp/src/arrow/dataset/projector.cc
##########
@@ -46,6 +46,15 @@ Status CheckProjectable(const Schema& from, const Schema&
to) {
from);
}
+ if (from_field->type()->id() == Type::NA) {
+ // promotion from null to any type is supported
+ if (to_field->nullable()) continue;
+
+ return Status::TypeError("field ", to_field->ToString(),
+ " is not nullable and but has type ",
NullType(),
Review comment:
"and but"?
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