public com.google.protobuf.Value.Builder getDefaultBuilder() {
      bitField0_ |= 0x00000020;
      onChanged();
      return getDefaultFieldBuilder().getBuilder();
    }
<pre>
Optional. Default value of the data.
</pre>

<code>.google.protobuf.Value default = 23 [(.google.api.field_behavior) = OPTIONAL];</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Schema.java