in Sources/SparkConnect/SparkConnectClient.swift [253:263]
func getPlanRange(_ start: Int64, _ end: Int64, _ step: Int64) -> Plan {
var range = Range()
range.start = start
range.end = end
range.step = step
var relation = Relation()
relation.range = range
var plan = Plan()
plan.opType = .root(relation)
return plan
}