wesm commented on a change in pull request #7279: URL: https://github.com/apache/arrow/pull/7279#discussion_r432048400
########## File path: r/R/scalar.R ########## @@ -0,0 +1,56 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + +#' @include arrowExports.R + +#' Arrow scalars +#' +#' @description +#' `Scalar`s are used to store a singular value of an arrow `DataType` +#' +#' @name Scalar +#' @rdname Scalar +#' @export +Scalar <- R6Class("Scalar", inherit = ArrowObject, + public = list( + ToString = function() Scalar__ToString(self), + cast = function(target_type) { + Scalar$create(Scalar__CastTo(self, as_type(target_type))) + }, + as_vector = function() Scalar__as_vector(self) + ), + active = list( + is_valid = function() Scalar__is_valid(self), + type = function() DataType$create(Scalar__type(self)) + ) +) +Scalar$create <- function(x) { + # TODO: it would probably be best if an explicit type could be provided Review comment: That's fine then. If it turns out there are some shortcomings (creating timestamp scalars with different units?) then we can always deal with it later. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
