Values.JobManifestSpecSourceDescribes the format of a manifest. If the manifest is in CSV format, also describes the columns contained within the manifest.
type nonrec t = {format : JobManifestFormat.t;Indicates which of the available formats the specified manifest uses.
*)fields : JobManifestFieldList.t option;If the specified manifest object is in the S3BatchOperations_CSV_20180820 format, this element describes which columns contain the required data.
*)}