mapleFU commented on code in PR #43782:
URL: https://github.com/apache/arrow/pull/43782#discussion_r1945885089
##########
cpp/src/arrow/compute/kernels/scalar_cast_nested.cc:
##########
@@ -404,14 +400,20 @@ struct CastStruct {
int out_field_index = 0;
for (int field_index : fields_to_select) {
- const auto& target_type = out->type()->field(out_field_index++)->type();
+ const auto& target_field = out->type()->field(out_field_index++);
+ const auto& target_type = target_field->type();
if (field_index == kFillNullSentinel) {
ARROW_ASSIGN_OR_RAISE(auto nulls,
MakeArrayOfNull(target_type->GetSharedPtr(),
batch.length));
out_array->child_data.push_back(nulls->data());
} else {
const auto& values =
(in_array.child_data[field_index].ToArrayData()->Slice(
in_array.offset, in_array.length));
+ if (!target_field->nullable() && values->null_count > 0) {
+ return Status::TypeError("field '", target_field->name(),
Review Comment:
Ignore me, i previously think we can
```
auto values = (in_array.child_data[field_index].ToArrayData()->Slice(
in_array.offset, in_array.length));
if (out field not nullable but in field nullable) {
if (values->GetNullCount() > 0) {
return error
}
values->buffers[0].reset();
}
```
But I also think this doesn't matter here
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