Bug 132805 Set descending to outer group will affect inner group.
Description: Set descending to outer group will affect inner group. Steps to reproduce: 1. New a sample datasource and dataset from orders. 2. Drag the dataset to Layout. 3. Add a group on ordernumber, interval 10, descending. 4. Add another group on orderdate, interval day 2, ascending. 5. Preview. Expected result: Data are grouped correctly. Actual result: Inner group didn't work unless you set outer group's sort to asc.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/expression/ColumnReferenceExpression.java
return m_columnIndex;
	}
	
	
	/**
	 * @see org.eclipse.birt.data.engine.expression.CompiledExpression#evaluate(org.mozilla.javascript.Context, org.mozilla.javascript.Scriptable)
	 */
	public Object evaluate(Context context, Scriptable scope) throws DataException
	{
		
		
		 
		
		StringBuffer expr = new StringBuffer( this.rowIndicator+"[");
		if ( isIndexed() )
		{
			expr.append(m_columnIndex);
		}
		else
		{
			expr.append('"');
			expr.append( m_columnName );
			expr.append('"');
		}
		expr.append(']');
		return ScriptEvalUtil.evaluateJSAsExpr( context, scope, 
					expr.toString( ),"ROM Expression", 0);
	}
}