felipecrv commented on code in PR #35674:
URL: https://github.com/apache/arrow/pull/35674#discussion_r1198162199
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cpp/src/arrow/array/array_nested.cc:
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@@ -177,6 +177,8 @@ Result<std::shared_ptr<Array>> FlattenListArray(const
ListArrayT& list_array,
// Final attempt to avoid invoking Concatenate().
if (non_null_fragments.size() == 1) {
return non_null_fragments[0];
+ } else if (non_null_fragments.size() == 0) {
+ return MakeEmptyArray(value_array->type(), memory_pool);
Review Comment:
You can force the null calculation in the tests by calling `GetNullCount()`.
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