Method needToImplement

core/src/main/java/org/apache/calcite/util/Util.java:1208–1214

Returns a java.lang.RuntimeException indicating that a particular feature has not been implemented, but should be. If every 'hole' in our functionality uses this method, it will be easier for us to identify the holes. Throwing a java.lang.UnsupportedOperationException isn't as go

(@Nullable Object o)

   * @return an {@link UnsupportedOperationException}.
   */
  public static RuntimeException needToImplement(@Nullable Object o) {
    String description = null;
    if (o != null) {
      description = o.getClass().toString() + ": " + o.toString();
    }
    throw new UnsupportedOperationException(description);
  }

  /**
   * Flags a piece of code as needing to be cleaned up before you check in.