SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function toColumnTypeName (children 1)
     ExpressionList (children 1)
      Function toLowCardinality (children 1)
       ExpressionList (children 1)
        Function materialize (children 1)
         ExpressionList (children 1)
          Literal \'foo\'
