void createGroup(T)(DataFrame!T df, int[] levels) Description: Funtion to create a groupBy object from a DataFrame @parmas: df - DataFrame on which groupBy is operated @params: levels - levels to consider for grouping
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void createGroup(T)(DataFrame!T df, int[] levels) Description: Funtion to create a groupBy object from a DataFrame @parmas: df - DataFrame on which groupBy is operated @params: levels - levels to consider for grouping