Bug 182680 Use feature of new Aggregation framework of Data Engine.
DataEngine will implement new aggregation framework in 2.2.0RC0. After the implementation is finished Engine should go ahead to use new column bindings in definition of map/highlight.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ExpressionUtil.java
if ( ( !omitNextQuote ) && chars[i] == '\'' )
		{
			candidateKey2 = !candidateKey2;
			if ( candidateKey2 )
				candidateKey1 = true;
		}
		if ( chars[i] == '\\' )
			omitNextQuote = true;
		else
			omitNextQuote = false;
		return new ParseIndicator( retrieveSize,
				i,
				candidateKey1,
				omitNextQuote,
				candidateKey1,
				candidateKey2 );
	}
	/**
	 * Test whether the char immediately before the candidate "row" key is
	 * valid.
	 * 
	 * @param operator
	 * @return
	 */
	private static boolean isValidProceeding( char operator )
	{
		if ( ( operator >= 'A' && operator <= 'Z' )
				|| ( operator >= 'a' && operator <= 'z' ) || operator == '_' )
			return false;
		return true;