Wes McKinney created ARROW-5991:
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Summary: [C++] Does DictionaryBuilder<T> need to be a subclass of
ArrayBuilder?
Key: ARROW-5991
URL: https://issues.apache.org/jira/browse/ARROW-5991
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Wes McKinney
I note that {{DictionaryBuilder<T>}} is book-keeping properties both in
{{values_builder_}} as well as itself, such as {{length_}} and {{null_count_}}.
There are two possibilities:
* DictionaryBuilder need not be a subclass of ArrayBuilder
* A common abstract base for builders could be defined to allow properties like
{{length_}} to be forwarded by virtual overrides
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