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ARROW-15712 [R] Add a `type` method for `Expression` objects#12447

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dragosmg wants to merge 2 commits into

apache:masterapache/arrow:masterfrom

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ARROW-15712 [R] Add a `type` method for `Expression` objects#12447
dragosmg wants to merge 2 commits into
apache:masterfrom
dragosmg:type_method_for_expression

update unit tests

24a4a39

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