Kouhei Sutou created ARROW-5355:
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             Summary: [C++] DictionaryBuilder provides information to determine 
array builder type at run-time
                 Key: ARROW-5355
                 URL: https://issues.apache.org/jira/browse/ARROW-5355
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Kouhei Sutou


This is needed for Arrow GLib. In Arrow GLib, we need to determine how to wrap 
Arrow C++ `ArrayBuilder` at run-time. `ArrayBuilder` may be passed as a generic 
`ArrayBuilder` instead of concrete `DictionaryBuilder`. (e.g. 
`RecordBatchBuilder::GetField()`)

See also: https://github.com/apache/arrow/pull/4316#issuecomment-492995395



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