Bug 131011 Support running query based on report document data
Data Engine should support running a query based on data set and expression data stored in a report document. This bugzilla entry serves as a repository for design docs and notes related to this feature.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutorUtil.java
{
	/**
	 * NO instance
	 */
	private QueryExecutorUtil()
	{		
	}
	
	/**
	 * Convert IGroupDefn to IQuery.GroupSpec
	 * 
	 * @param cx
	 * @param src
	 * @return
	 * @throws DataException
	 * @deprecated
	 */
	static IQuery.GroupSpec groupDefnToSpec( Context cx,
			IGroupDefinition src, String columnName, int index )
			throws DataException
	{
/*		int groupIndex = -1;
		String groupKey = src.getKeyColumn();
		boolean isComplexExpression = false;