Câu 51: Databricks Certified Associate Developer for Apache Spark

Which of the following pairs of arguments cannot be used in DataFrame.join() to perform an inner join on two DataFrames, named and aliased with "a" and "b" respectively, to specify two key columns?

1. A. on = [a.column1 == b.column1, a.column2 == b.column2]
2. B. on = [col("column1"), col("column2")] — đáp án hiện tại
3. C. on = [col("a.column1") == col("b.column1"), col("a.column2") == col("b.column2")]
4. D. All of these options can be used to perform an inner join with two key columns.
5. E. on = ["column1", "column2"]