Pipeline with spanner source and sink fails with `Table not found` exception in following scenarios:
1.) Spanner source uses different service account file than spanner sink
2.) Spanner source reads from different instance id than spanner sink with same service account file
3.) Spanner source reads from same instance id but different database than spanner sink with same service account file
Pipeline succeeds when spanner source uses same service account, instance id and database as spanner sink.