Bug 188038 Need know which measure ComputedColumnHandle aggregate on.
GUI need to show the measure name ont the data item in the aggregation cell.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/util/OlapExpressionCompiler.java
{
			return getReferencedDimLevel( ((IScriptExpression)expr), bindings, onlyFromDirectReferenceExpr );
		}
		else if ( expr instanceof IConditionalExpression )
		{
			Set result = new HashSet();
			IScriptExpression expr1 = ((IConditionalExpression)expr).getExpression( );
			result.addAll( getReferencedDimLevel( expr1, bindings, onlyFromDirectReferenceExpr ));
			
			IScriptExpression op1 = ((IConditionalExpression)expr).getOperand1( );
			result.addAll( getReferencedDimLevel( op1, bindings,onlyFromDirectReferenceExpr ));
						
			IScriptExpression op2 = ((IConditionalExpression)expr).getOperand2( );
			result.addAll( getReferencedDimLevel( op2, bindings,onlyFromDirectReferenceExpr ));
			return result;
		}
		
		return null;
	}
	
	/**
	 * 
	 * @param expr
	 * @param bindings
	 * @param onlyFromDirectReferenceExpr
	 * @return
	 * @throws DataException
	 */
	private static Set getReferencedDimLevel( IScriptExpression expr, List bindings, boolean onlyFromDirectReferenceExpr ) throws DataException
	{