public java.lang.String getOrderBy() {
      java.lang.Object ref = orderBy_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        orderBy_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
A comma-separated list of fields to order by, sorted in ascending order.
Use "desc" after a field name for descending.
Supported fields:

  * `display_name`
  * `create_time`
  * `update_time`

Example: `display_name, create_time desc`.
</pre>

<code>string order_by = 6;</code>

@return The orderBy.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ListEndpointsRequest.java