How to merge Dataframes in spark as in Pandas

def merge(left: Dataset, right: Dataset, left_on: Seq[String], right_on: Seq[String], how: String): Dataset =
{
	import org.apache.spark.sql.functions.lit
	val joinExpr = left_on.zip(right_on).foldLeft(lit(true)) { case (acc, (lkey, rkey)) => acc and (left(lkey) === right(rkey)) }
	left.join(right, joinExpr, how).toDS
}