BigQueryAuditMetadata.TableDeletion.Reason

Describes how the table was deleted.

Enums
REASON_UNSPECIFIED Unknown.
DATASET_DELETE_REQUEST Was deleted using the datasets.delete REST API request with the delete_contents set to true. Note that the dataset itself may not have been deleted.
TABLE_DELETE_REQUEST Was deleted using the tables.delete REST API.
EXPIRED Table expired.
QUERY Table deleted using DDL query.