SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function any (children 1)
     ExpressionList (children 1)
      Function toTypeName (children 1)
       ExpressionList (children 1)
        Identifier s
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias t1) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function CAST (alias s) (children 1)
            ExpressionList (children 2)
             Literal \'a\'
             Literal \'String\'
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias t2) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function CAST (alias s) (children 1)
            ExpressionList (children 2)
             Literal \'b\'
             Literal \'LowCardinality(String)\'
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier s
