SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 6)
   ExpressionList (children 5)
    Literal \'Nul\\0able\\0String)Nul\\0\\0ble(String)Nul\\0able(String)Nul\\0able(String)\'
    Function and (children 1)
     ExpressionList (children 2)
      Literal NULL
      Literal UInt64_2
    Literal \'\'
    Identifier number
    Literal NULL (alias k)
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 2)
           Function or (children 1)
            ExpressionList (children 2)
             Function materialize (children 1)
              ExpressionList (children 1)
               Literal NULL
             Function materialize (children 1)
              ExpressionList (children 1)
               Literal Int64_-9223372036854775808
           Identifier number
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier system.numbers
          Literal UInt64_1000000
   ExpressionList (children 3)
    OrderByElement (children 1)
     Identifier k
    OrderByElement (children 1)
     Identifier number
    OrderByElement (children 1)
     Identifier k
   Literal UInt64_1023
   Literal UInt64_1023
   Set
 Identifier Null