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Will JonesJonathan Keane
c5b757fe607
Will Jones authored and Jonathan Keane committed f92219d05e0
ARROW-10456: [R] Implement MapType and MapArray

This PR adds `MapType` and `MapArray` to R implementation. Importantly, this enables R users to read Parquet and Feather files containing map arrays.

Closes #11956 from wjones127/ARROW-10456-r-map-type

Authored-by: Will Jones <willjones127@gmail.com>
Signed-off-by: Jonathan Keane <jkeane@gmail.com>