private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vertexai.api.ExecutableCode,
            com.google.cloud.vertexai.api.ExecutableCode.Builder,
            com.google.cloud.vertexai.api.ExecutableCodeOrBuilder>
        getExecutableCodeFieldBuilder() {
      if (executableCodeBuilder_ == null) {
        if (!(dataCase_ == 8)) {
          data_ = com.google.cloud.vertexai.api.ExecutableCode.getDefaultInstance();
        }
        executableCodeBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vertexai.api.ExecutableCode,
                com.google.cloud.vertexai.api.ExecutableCode.Builder,
                com.google.cloud.vertexai.api.ExecutableCodeOrBuilder>(
                (com.google.cloud.vertexai.api.ExecutableCode) data_,
                getParentForChildren(),
                isClean());
        data_ = null;
      }
      dataCase_ = 8;
      onChanged();
      return executableCodeBuilder_;
    }
<pre>
Optional. Code generated by the model that is meant to be executed.
</pre>

<code>
.google.cloud.vertexai.v1.ExecutableCode executable_code = 8 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Part.java