yannan-wyn opened a new issue, #48646:
URL: https://github.com/apache/arrow/issues/48646
### Describe the enhancement requested
1. The current implementation of StructBuilder appends empty to each child
vector for each appended null.
2. In some scenarios, I try to extract child[0], and theoretically, the row
that was appended as null should also be null. However, this is not the case in
practice (because the current implementation uses AppendEmpty for child arrays).
I would like to rewrite the code like this:
Status AppendNull() final {
for (const auto& field : children_) {
ARROW_RETURN_NOT_OK(field->AppendNull());
}
return Append(false);
}
### Component(s)
C++
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