@@ -3070,7 +3070,7 @@ def copy_table(
 job_id_prefix: Optional[str] = None,
 location: Optional[str] = None,
 project: Optional[str] = None,
-job_config: CopyJobConfig = None,
+job_config: Optional[CopyJobConfig] = None,
 retry: retries.Retry = DEFAULT_RETRY,
 timeout: TimeoutType = DEFAULT_TIMEOUT,
 ) -> job.CopyJob:
@@ -3176,7 +3176,7 @@ def extract_table(
 job_id_prefix: Optional[str] = None,
 location: Optional[str] = None,
 project: Optional[str] = None,
-job_config: ExtractJobConfig = None,
+job_config: Optional[ExtractJobConfig] = None,
 retry: retries.Retry = DEFAULT_RETRY,
 timeout: TimeoutType = DEFAULT_TIMEOUT,
 source_type: str = "Table",
@@ -3271,7 +3271,7 @@ def extract_table(
 def query(
 self,
 query: str,
-job_config: QueryJobConfig = None,
+job_config: Optional[QueryJobConfig] = None,
 job_id: Optional[str] = None,
 job_id_prefix: Optional[str] = None,
 location: Optional[str] = None,