js8544 commented on code in PR #36891:
URL: https://github.com/apache/arrow/pull/36891#discussion_r1275041966
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cpp/src/arrow/array/util.cc:
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@@ -538,7 +538,7 @@ class NullArrayFactory {
out_->buffers.resize(3);
out_->buffers[2] = buffer_;
- child_length = 1;
+ child_length = length_ > 0 ? 1 : 0;
Review Comment:
Function executor would call MakeNullArray with length zero when the input
length is zero. The current implementation of MakeNullArray has a bug when the
type is `list(dense_union(string))`, which is fixed by this change.
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