How to change a column position in a spark dataframe?

Question

I was wondering if it is possible to change the position of a column in a dataframe, actually to change the schema?

Precisely if I have got a dataframe like [f

Answer 1

You can get the column names, reorder them however you want, and then use select on the original DataFrame to get a new one with this new order:

val columns: Array[String] = dataFrame.columns
val reorderedColumnNames: Array[String] = ??? // do the reordering you want
val result: DataFrame = dataFrame.select(reorderedColumnNames.head, reorderedColumnNames.tail: _*)