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liyafan82Micah Kornfield
776165c57cb
liyafan82 authored and Micah Kornfield committed 7fc4a372850
ARROW-6672: [Java] Extract a common interface for dictionary builders

We need a common interface for dictionary builders to support more sophisticated scenarios, like collecting dictionary statistics.

Closes #5486 from liyafan82/fly_0923_build and squashes the following commits:

04e8e65e6 <liyafan82>  Extract a common interface for dictionary builders

Authored-by: liyafan82 <fan_li_ya@foxmail.com>
Signed-off-by: Micah Kornfield <emkornfield@gmail.com>