User-defined types (UDTs)

You can define a custom type to use in your table. For example, you can create a member type that includes a text field called email and a date field called birthday.

Fields in a user-defined type can be any of the supported field types, except for maps, lists, sets, or other user-defined types.

You can use a user-defined type as the type of a column or as the value type of a map, list, or set column. You can’t use a user-defined type as the key type of a map column.