How to Join Multiple Columns in Spark SQL using Java for filtering in DataFrame

Question

• DataFrame a = contains column x,y,z,k

• DataFrame b = contains column x,y,a

  a.join(b,
  
          

Answer 1

Spark SQL provides a group of methods on Column marked as java_expr_ops which are designed for Java interoperability. It includes and (see also or) method which can be used here:

a.col("x").equalTo(b.col("x")).and(a.col("y").equalTo(b.col("y"))