Values.DataSourcesSourceval to_value :
DataSource.t list ->
[> `List of
[> `Structure of
(string
* [> `Boolean of ComputeStatistics.t
| `Enum of string
| `Long of LongType.t
| `String of EntityId.t
| `Structure of
(string
* [> `String of RedshiftDatabaseUsername.t
| `Structure of
(string * [> `String of RedshiftDatabaseName.t ]) list ])
list
| `Timestamp of EpochTime.t ])
list ]
list ]