[GitHub] [arrow] sunchao commented on issue #2700: ARROW-3398: [Rust] Update existing Builder to use MutableBuffer internally

[GitHub]

Overall LGTM - just a few minor nits. More curious on how this is going to be 
used to build `ArrayData` and `Array`.

[ Full content available at: https://github.com/apache/arrow/pull/2700 ]
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