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
CompilerEnvirons ce = new CompilerEnvirons();
		Parser p = new Parser( ce, cx.getErrorReporter( ) );
		ScriptOrFnNode tree = p.parse( expr, null, 0 );
		
		return getScriptObjectName( tree, objectName );
	}
	
	/**
	 * 
	 * @param expr
	 * @param bindings
	 * @return
	 * @throws DataException
	 */
	public static Set getReferencedDimLevel( IBaseExpression expr, List bindings ) throws DataException
	{
		return getReferencedDimLevel( expr, bindings, false );
	}
	
	/**
	 * Get set of reference DimLevels. 
	 * @param expr
	 * @param bindings
	 * @param onlyFromDirectReferenceExpr
	 * @return
	 * @throws DataException
	 */
	public static Set getReferencedDimLevel( IBaseExpression expr, List bindings, boolean onlyFromDirectReferenceExpr ) throws DataException
	{
		if ( expr instanceof IScriptExpression )