jorisvandenbossche commented on code in PR #14838:
URL: https://github.com/apache/arrow/pull/14838#discussion_r1039573429
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cpp/src/arrow/array/array_nested.cc:
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@@ -683,7 +683,7 @@ void SparseUnionArray::SetData(std::shared_ptr<ArrayData>
data) {
ARROW_CHECK_EQ(data_->buffers.size(), 2);
// No validity bitmap
- ARROW_CHECK_EQ(data_->buffers[0], nullptr);
+ data_->buffers[0] = nullptr;
Review Comment:
https://github.com/apache/arrow/blob/54ff2d8777717ea5bb811f3653deeb12fc93452e/cpp/src/arrow/array/array_nested.cc#L661
That line in StructArray::GetFlattenedField is wrong if the child is a union
type, I suppose
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