[hibernate-dev] Difference between Comment and Hint in Hibernate query

Hi, While working on integrating a Pull Request, I realized that the org.hibernate.engine.spi.QueryParameters provides these two attributes: private String comment; private List<String> queryHints; Both these two are to be sent to the database, so why do we have both? I also noticed that only for Query Hints we do take into consideration DB specific query hint syntax: // Keep this here, rather than moving to Select. Some Dialects may need the hint to be appended to the very // end or beginning of the finalized SQL statement, so wait until everything is processed. if ( parameters.getQueryHints() != null && parameters.getQueryHints().size() > 0 ) { sql = dialect.getQueryHintString( sql, parameters.getQueryHints() ); } Shouldn't we only have either comment or queryHints? Or what is the difference between these two? Vlad