spark dataframe select multiple columns
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spark dataframe select multiple columns
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how to add column to spark dataframe
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spark dataframe select multiple columns, spark dataframe drop multiple columns, spark dataframe select rows by column value, spark dataframe list columns, spark dataframe join multiple columns, spark dataframe join select columns, spark dataframe column to list, select in spark dataframe, how to add column to spark dataframe, spark dataframe column type, spark dataframe column names, spark dataframe show column