Paul Taylor created ARROW-2214:
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             Summary: [JS] proxy DictionaryVector's nullBitmap to its indices' 
nullBitmap
                 Key: ARROW-2214
                 URL: https://issues.apache.org/jira/browse/ARROW-2214
             Project: Apache Arrow
          Issue Type: Bug
    Affects Versions: JS-0.3.0
            Reporter: Paul Taylor
            Assignee: Paul Taylor


We need to add a {{nullBitmap}} getter to {{DictionaryData}} that proxies to 
the indices {{nullBitmap}}, like we do with the {{nullCount}}. This is blocking 
the PR that updates JPMC Perspective to v0.3.0: 
[https://github.com/jpmorganchase/perspective/pull/55#issuecomment-368164271|https://github.com/jpmorganchase/perspective/pull/55#issuecomment-368164271.].
 [~wesmckinn] can we do a patch release v0.3.1 once this PR is merged, since 
it's blocking a 3rd party PR?



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