SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function max (alias aid) (children 1)
     ExpressionList (children 1)
      Identifier id
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Function materialize (alias id) (children 1)
            ExpressionList (children 1)
             Function toLowCardinality (children 1)
              ExpressionList (children 1)
               Literal \'aaaa\'
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function numbers_mt (children 1)
              ExpressionList (children 1)
               Literal UInt64_1000000
 Identifier Null