bkietz closed issue #38457: [C++] Real null count for DictionaryArray
URL: https://github.com/apache/arrow/issues/38457
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R-JunmingChen opened a new issue, #38457:
URL: https://github.com/apache/arrow/issues/38457
### Describe the enhancement requested
Currently, `DictionaryArray.null_count()` counts the number of nulls among
the dict indices, but ignores nulls among dict values. It will be useful that
