[jira] [Created] (ARROW-1721) [Python] Support null mask in places where it isn't supported in numpy_to_arrow.cc

[Wes McKinney (JIRA)]

Wes McKinney created ARROW-1721:
-----------------------------------

             Summary: [Python] Support null mask in places where it isn't 
supported in numpy_to_arrow.cc
                 Key: ARROW-1721
                 URL: https://issues.apache.org/jira/browse/ARROW-1721
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
            Reporter: Wes McKinney
             Fix For: 0.8.0


see https://github.com/apache/spark/pull/18664#discussion_r146472109 for 
SPARK-21375



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