public boolean hasDefault() {
      return ((bitField0_ & 0x00000020) != 0);
    }
<pre>
Optional. Default value of the data.
</pre>

<code>.google.protobuf.Value default = 23 [(.google.api.field_behavior) = OPTIONAL];</code>

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