scala - Spark : How to union all dataframe in loop

Question

Is there a way to get the dataframe that union dataframe in loop?

This is a sample code:

var fruits = List(
  \"apple\"
  ,\"orange\"
  ,\"melon\"
)          


        

Answer 1

If you have different/multiple dataframes you can use below code, which is efficient.

val newDFs = Seq(DF1,DF2,DF3)
newDFs.reduce(_ union _)