Bug 201013 [Automation][Regression]Invalid group key column name: _{$TEMP_GROUP_1$} occurs when preview attached report[1102]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
List queryFilters, List temporaryComputedColumns ) throws DataException
	{
		List result = new ArrayList( );
		prepareFilter( cx, dataSetFilters, temporaryComputedColumns, result );
		prepareFilter( cx, queryFilters, temporaryComputedColumns, result );
		return result;
	}
	/**
	 * 
	 * @param cx
	 * @param dataSetFilters
	 * @param temporaryComputedColumns
	 * @param result
	 * @throws DataException 
	 */
	private void prepareFilter( Context cx, List dataSetFilters,
			List temporaryComputedColumns, List result ) throws DataException
	{
		if ( dataSetFilters != null && !dataSetFilters.isEmpty( ) )
		{
			Iterator it = dataSetFilters.iterator( );
			for ( int i = 0; it.hasNext( ); i++ )
			{
				IFilterDefinition src = (IFilterDefinition) it.next( );
				IBaseExpression expr = src.getExpression( );
				if ( isGroupFilter( src ) )
				{
					ConditionalExpression ce = ( (ConditionalExpression) expr );
					String exprText = ce.getExpression( ).getText( );
					ColumnInfo columnInfo = QueryExecutorUtil.getColInfoFromJSExpr( cx,