public com.google.protobuf.ByteString getFormatBytes() {
      java.lang.Object ref = format_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        format_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
Optional. The format of the data.
Supported formats:
 for NUMBER type: "float", "double"
 for INTEGER type: "int32", "int64"
 for STRING type: "email", "byte", etc
</pre>

<code>string format = 7 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for format.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Schema.java