[jira] [Created] (ARROW-12781) [R] Define ArrowDatum methods for is.type() generic functions

["Ian Cook (Jira)" <ji...@apache.org>]

Ian Cook created ARROW-12781:
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             Summary: [R] Define ArrowDatum methods for is.type() generic functions
                 Key: ARROW-12781
                 URL: https://issues.apache.org/jira/browse/ARROW-12781
             Project: Apache Arrow
          Issue Type: Improvement
          Components: R
            Reporter: Ian Cook


Define {{ArrowDatum}} methods for the base R generic {{is.type()}} functions, including:
 * {{is.numeric()}}
 * {{is.double()}}
 * {{is.integer()}}
 * {{is.integer64()}}
 * {{is.character()}}
 * {{is.logical()}}
 * {{is.factor() # TRUE for dictionary types}}
 * {{is.ordered() # TRUE for ordered dictionary types}}
 * {{is.list() # TRUE for ListArrays}}

Consider whether it would be better to define some or possibly all these only for dplyr (in {{nse_funcs}}, not as {{ArrowDatum}} methods) to prevent users from being confused when, for example, {{is.list()}} returns {{TRUE}} on an object that is not an R list.



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