@java.lang.Override
  public com.google.protobuf.ByteString getWorkflowRevisionIdBytes() {
    java.lang.Object ref = workflowRevisionId_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      workflowRevisionId_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
Output only. Revision of the workflow this execution is using.
</pre>

<code>string workflow_revision_id = 8 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The bytes for workflowRevisionId.
java-workflow-executions/proto-google-cloud-workflow-executions-v1beta/src/main/java/com/google/cloud/workflows/executions/v1beta/Execution.java