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Romain Francois authored and Wes McKinney committed cd74741c635
ARROW-3807: [R] Missing Field API Exposed the `field()` function, +Field$type(), +Field$Equals() Author: Romain Francois <romain@purrple.cat> Closes #2981 from romainfrancois/field and squashes the following commits: ae3dcef53 <Romain Francois> ARROW-3807: Missing Field API