SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Literal NULL
    Identifier id
    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 3)
           Literal NULL
           Function max (children 1)
            ExpressionList (children 1)
             Identifier id
           Function materialize (alias id) (children 1)
            ExpressionList (children 1)
             Function toLowCardinality (children 1)
              ExpressionList (children 1)
               Literal \'\'
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function numbers_mt (children 1)
              ExpressionList (children 2)
               Literal UInt64_0
               Literal UInt64_1
 Identifier Null