milesgranger commented on code in PR #14838:
URL: https://github.com/apache/arrow/pull/14838#discussion_r1039557419
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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:
That may be so. I was thinking, constructing UnionArray or otherwise
UnionArray::SetData must have the authority to ensure validity bitmap is null
given it's in the specification that they don't have validity bitmaps?
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