Uwe L. Korn updated ARROW-1964:
    Summary: [Python] Expose Builder classes  (was: Python: Expose Builder 

> [Python] Expose Builder classes
> -------------------------------
>                 Key: ARROW-1964
>                 URL: https://issues.apache.org/jira/browse/ARROW-1964
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: Python
>            Reporter: Uwe L. Korn
>            Priority: Major
>              Labels: beginner
>             Fix For: 1.0.0
> Having the builder classes available from Python would be very helpful. 
> Currently a construction of an Arrow array always need to have a Python list 
> or numpy array as intermediate. As  the builder in combination with jemalloc 
> are very efficient in building up non-chunked memory, it would be nice to 
> directly use them in certain cases.

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