public Builder setFunctionCall(
        com.google.cloud.vertexai.api.FunctionCall.Builder builderForValue) {
      if (functionCallBuilder_ == null) {
        data_ = builderForValue.build();
        onChanged();
      } else {
        functionCallBuilder_.setMessage(builderForValue.build());
      }
      dataCase_ = 5;
      return this;
    }
<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>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Part.java