SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function joinGet (children 1)
     ExpressionList (children 3)
      Literal \'join_string_key\'
      Literal \'x\'
      Literal \'abc\'
    Function joinGet (children 1)
     ExpressionList (children 3)
      Literal \'join_string_key\'
      Literal \'k\'
      Literal \'abc\'
