@java.lang.Override
    public boolean hasFunctionCall() {
      return dataCase_ == 5;
    }
<pre>
Optional. A predicted [FunctionCall] returned from the model that
contains a string representing the [FunctionDeclaration.name] with the
parameters and their values.
</pre>

<code>
.google.cloud.vertexai.v1.FunctionCall function_call = 5 [(.google.api.field_behavior) = OPTIONAL];
</code>

@return Whether the functionCall field is set.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Part.java