joinExprs = col(“a.column1”) === col(“b.column1”) and col(“a.column2”) === col(“b.column2”)

usingColumns = Seq(col(“column1”), col(“column2”))

All of these options can be used to perform an inner join with two key columns.

joinExprs = storesDF(“column1”) === employeesDF(“column1”) and storesDF(“column2”) === employeesDF (“column2”)

usingColumns = Seq(“column1”, “column2”)