#' Relation
#'
#' @export
#' @format \code{\link{R6Class}} object, super class \code{\link{IdObject}}, sub classes \code{\link{TableRelation}}, \code{\link{WhereRelation}}, \code{\link{DistinctRelation}}, \code{\link{ReferenceRelation}}, \code{\link{InMemoryRelation}}, \code{\link{RenameRelation}}, \code{\link{UnionRelation}}, \code{\link{SimpleRelation}}, \code{\link{GatherRelation}}, \code{\link{CompositeRelation}}, \code{\link{GroupByRelation}}.
#' @field id of type String inherited from super class \code{\link{IdObject}}.
Relation <- R6::R6Class("Relation", inherit = IdObject, public = list(initialize = function(json = NULL) {
super$initialize(json = json)
}, init = function() {
super$init()
}, initJson = function(json) {
super$initJson(json)
}, toTson = function() {
m = super$toTson()
m$kind = tson.scalar("Relation")
return(m)
}))
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