SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Literal \'parallel right-only\'
    Function countIf (children 1)
     ExpressionList (children 1)
      Function isNull (children 1)
       ExpressionList (children 1)
        Identifier l.k
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier l
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier r
     TableJoin (children 1)
      Function and (children 1)
       ExpressionList (children 2)
        Function equals (children 1)
         ExpressionList (children 2)
          Identifier l.k
          Identifier r.k
        Function greater (children 1)
         ExpressionList (children 2)
          Identifier l.v
          Identifier r.v
