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/executor/transform/group/GroupBy.java
*/
	int getColumnIndex( )
	{
		return columnIndex;
	}
	
	String getColumnName( )
	{
		return columnName;
	}
	/**
	 * Gets the GroupSpec associated with this group by
	 */
	GroupSpec getGroupSpec( )
	{
		return groupSpec;
	}
	private static boolean isNumber( Class columnType )
	{
		return Number.class.isAssignableFrom( columnType );
	}
	private static boolean isString( Class columnType )
	{
		return String.class.isAssignableFrom( columnType );
	}
	private static boolean isDate( Class columnType )
	{
		return Date.class.isAssignableFrom( columnType );
	}
}