SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Function joinGet (children 1)
       ExpressionList (children 3)
        Literal \'join_tbl\'
        Literal \'name\'
        Function toLowCardinality (children 1)
         ExpressionList (children 1)
          Function materialize (children 1)
           ExpressionList (children 1)
            Literal \'xxx\'
      Literal \'yyy\'
