public Builder clearWorkflow() {
      bitField0_ = (bitField0_ & ~0x00000001);
      workflow_ = null;
      if (workflowBuilder_ != null) {
        workflowBuilder_.dispose();
        workflowBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Required. Workflow to be updated.
</pre>

<code>
.google.cloud.workflows.v1.Workflow workflow = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-workflows/proto-google-cloud-workflows-v1/src/main/java/com/google/cloud/workflows/v1/UpdateWorkflowRequest.java