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tianchenMicah Kornfield
d47d3ba7514
tianchen authored and Micah Kornfield committed eae2c1b286b
ARROW-7152: [Java] Delete useless class DiffFunction

Related to [ARROW-7152](https://issues.apache.org/jira/browse/ARROW-7152).

DiffFunction was used in the initial implementation of visitors, since currently visitors logic has been refactored and this class no longer useful.

Closes #5817 from tianchen92/ARROW-7152 and squashes the following commits:

6bf2f0361 <tianchen> ARROW-7152:  Delete useless class DiffFunction

Authored-by: tianchen <niki.lj@alibaba-inc.com>
Signed-off-by: Micah Kornfield <emkornfield@gmail.com>