Antoine Pitrou created ARROW-5215:
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Summary: [C++] Need a way to change integer size in DictBuilder
and AdaptiveIntBuilder
Key: ARROW-5215
URL: https://issues.apache.org/jira/browse/ARROW-5215
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Affects Versions: 0.13.0
Reporter: Antoine Pitrou
Currently, there's no way to choose the index type with DictionaryBuilder.
Consequently, it's difficult to implement e.g. casts to an specific dictionary
type (instead the DictionaryBuilder will select the smallest possible integer
size for the index type).
This will allow implementing "null to dict" casting.
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