Convert spark dataframe to Array[String]

This should do the trick:

df.select(columns: _*).collect.map(_.toSeq)

DataFrame to Array[String]

data.collect.map(_.toSeq).flatten

You can also use the following

data.collect.map(row=>row.getString(0))

If you have more columns then it is good to use the last one

 data.rdd.map(row=>row.getString(0)).collect

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