/**
	 * Constructs a PostgresPlusDialect
	 */
	public PostgresPlusDialect() {
		super();

		registerFunction( "ltrim", new StandardSQLFunction( "ltrim" ) );
		registerFunction( "rtrim", new StandardSQLFunction( "rtrim" ) );
		registerFunction( "soundex", new StandardSQLFunction( "soundex" ) );
		registerFunction( "sysdate", new NoArgSQLFunction( "sysdate", StandardBasicTypes.DATE, false ) );
		registerFunction( "rowid", new NoArgSQLFunction( "rowid", StandardBasicTypes.LONG, false ) );
		registerFunction( "rownum", new NoArgSQLFunction( "rownum", StandardBasicTypes.LONG, false ) );
		registerFunction( "instr", new StandardSQLFunction( "instr", StandardBasicTypes.INTEGER ) );
		registerFunction( "lpad", new StandardSQLFunction( "lpad", StandardBasicTypes.STRING ) );
		registerFunction( "replace", new StandardSQLFunction( "replace", StandardBasicTypes.STRING ) );
		registerFunction( "rpad", new StandardSQLFunction( "rpad", StandardBasicTypes.STRING ) );
		registerFunction( "translate", new StandardSQLFunction( "translate", StandardBasicTypes.STRING ) );
		registerFunction( "substring", new StandardSQLFunction( "substr", StandardBasicTypes.STRING ) );
		registerFunction( "coalesce", new NvlFunction() );
		registerFunction( "atan2", new StandardSQLFunction( "atan2", StandardBasicTypes.FLOAT ) );
		registerFunction( "mod", new StandardSQLFunction( "mod", StandardBasicTypes.INTEGER ) );
		registerFunction( "nvl", new StandardSQLFunction( "nvl" ) );
		registerFunction( "nvl2", new StandardSQLFunction( "nvl2" ) );
		registerFunction( "power", new StandardSQLFunction( "power", StandardBasicTypes.FLOAT ) );
		registerFunction( "add_months", new StandardSQLFunction( "add_months", StandardBasicTypes.DATE ) );
		registerFunction( "months_between", new StandardSQLFunction( "months_between", StandardBasicTypes.FLOAT ) );
		registerFunction( "next_day", new StandardSQLFunction( "next_day", StandardBasicTypes.DATE ) );
	}