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object RawWriters

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  6. def duplicateColumns(df: DataFrame, columns: String*): (DataFrame, Seq[String])

    Prepares a DataFrame with duplicated columns; useful for when wiriting with partitionBy and then reading a single subdirectory without losing data from the partitionBY columns.

    Prepares a DataFrame with duplicated columns; useful for when wiriting with partitionBy and then reading a single subdirectory without losing data from the partitionBY columns.

    Returns a new DataFrame with duplicates of the columns in columns and the list of new column names. The new names are created by prepending "_".

    df

    start datafame

    columns

    columns to duplicate

    returns

    a tuple (newDataFrame, newColumnNames)

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    (Since version ) see corresponding Javadoc for more information.

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