kszucs edited a comment on pull request #10093:
URL: https://github.com/apache/arrow/pull/10093#issuecomment-822068562
I reproduced the problem using a simple cast test from null array to a
dictionary array:
```cpp
TEST(Cast, FromNullToDictionary) {
auto from = std::make_shared<NullArray>(10);
auto to_type = dictionary(int8(), boolean());
ASSERT_OK_AND_ASSIGN(auto expected, MakeArrayOfNull(to_type, 10));
CheckCast(from, expected);
}
```
Somewhere `ArrayData::dictionary` gets set to nullptr or not set at all. I
don't have a solution yet, it's a but hard to debug due to the Datum variant.
cc @bkietz
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