getUColumn :: U.Unbox a => Text -> UColMap a -> U.Vector a
getUColumn nm cms = 
    let mclm = Map.lookup nm cms
    in case mclm of
            Just v -> v
            Nothing -> U.fromList []
getUColumn :: U.Unbox a => Text -> UColMap a -> U.Vector a
getUColumn nm cms = 
    let mclm = Map.lookup nm cms
    in case mclm of
            Just v -> v
            Nothing -> U.fromList []
getUColumn nm cms = 
    let mclm = Map.lookup nm cms
    in case mclm of
            Just v -> v
            Nothing -> U.fromList []