Bug 145022 Provide a utility method to help GUI enhance aggregate on.
DtE will provide a method hasAggregation(String expression) in org.eclipse.birt.core.data.ExpressionUtil, and the return value will be true when the expression is a valid JS expression and it has aggregation defined.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/ExpressionUtil.java
{
	
	private static final String ROW_INDICATOR = "row";
	
	private static final String DATASET_ROW_INDICATOR = "dataSetRow";
	private static String PREFIX = "COLUMN_";
	
	private static int suffix = 0;
	/**
	 * Return a row expression text according to given row name.
	 * 
	 * @param rowName
	 * @return
	 */
	public static String createRowExpression( String rowName )
	{
		return ROW_INDICATOR + "[\"" + rowName + "\"]";
	}
	/**