-- | Executes an RFilter operation
runRfilter ::
    RPredicate
    -> RTable
    -> RTable
runRfilter rpred rtab = 
    if isRTabEmpty rtab
        then emptyRTable
        else 
            V.filter rpred rtab
runRfilter ::
    RPredicate
    -> RTable
    -> RTable
runRfilter rpred rtab = 
    if isRTabEmpty rtab
        then emptyRTable
        else 
            V.filter rpred rtab
runRfilter rpred rtab = 
    if isRTabEmpty rtab
        then emptyRTable
        else 
            V.filter rpred rtab