AlterQuery  defaulted (children 2)
 ExpressionList (children 1)
  AlterCommand MODIFY_COLUMN (children 1)
   ColumnDeclaration payload_length (children 1)
    Function modulo (children 1)
     ExpressionList (children 2)
      Function length (children 1)
       ExpressionList (children 1)
        Identifier payload
      Literal UInt64_65535
 Identifier defaulted