* @param context the query shard context
     * @return the Lucene Query
     * @throws IOException if an I/O error occurs
     */
    @Override
    public Query toQuery(final QueryShardContext context) throws IOException {
        return queryBuilder.toQuery(context);
    }

    /**
     * Returns whether this query builder is a fragment.
     *
     * @return true if this is a fragment, false otherwise
     */