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https://issues.apache.org/jira/browse/ARROW-692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16045259#comment-16045259
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Julien Le Dem commented on ARROW-692:
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[~bryanc]
1) yes, the name is not important here. another option is to name it after the
field it is used for but it is true that a dictionary can be used for multiple
fields. I don't have a strong opinion there. The id field is already there so
forcing it in the name is not that useful. The name field is optional in the
schema so we can also say it is omitted for dictionaries.
2) i'd say a dictionary is always not nullable. nulls are stored in the
validity vector of the index field.
> Java<->C++ Integration tests for dictionary-encoded vectors
> -----------------------------------------------------------
>
> Key: ARROW-692
> URL: https://issues.apache.org/jira/browse/ARROW-692
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++, Java - Vectors
> Reporter: Wes McKinney
>
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