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Ji LiuGitHub
cd87ac96eb6
Ji Liu authored and GitHub committed b196d1a8631
ARROW-6839: [Java] Add APIs to read and write "custom_metadata" field of IPC file footer (#7231)

* ARROW-6839: [Java] Add APIs to read and write "custom_metadata" field of IPC file footer

* remove dictionary in test

* extract kv write methods and simplify tests

Co-authored-by: tianchen <niki.lj@alibaba-inc.com>