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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