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https://issues.apache.org/jira/browse/ARROW-1964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16311415#comment-16311415
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Wes McKinney commented on ARROW-1964:
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+1, particularly vector appends (NumPy, pandas, or other Arrow arrays)
> 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
> 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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