r - Error: length(cols) > 0 is not TRUE on SparkR agg function -

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i try group dataframe column:

>sparkr::agg(sparkr::groupby(df, "column_1"))

why following error:

error: length(cols) > 0 not true

i found out kind of error (see one) relates parameters provided function (here: agg). missed specifying output column:

sparkr::agg(sparkr::groupby(df, "column_1"), "column_1")

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