Bug 177504 Engine doesn't provide SubQuery for extended item
Engine doesn't provide SubQuery for extended item, so chart can't use container's binding to execute the query. If possible, engine could provide an option for extended item to choose whether engine could create the query, so extended item won't create SubQuery by itself.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/extension/internal/RowSet.java
/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/
package org.eclipse.birt.report.engine.extension.internal;
import org.eclipse.birt.core.exception.BirtException;
import org.eclipse.birt.data.engine.api.IBaseExpression;
import org.eclipse.birt.report.engine.api.DataSetID;
import org.eclipse.birt.report.engine.executor.ExecutionContext;
import org.eclipse.birt.report.engine.extension.IQueryResultSet;
import org.eclipse.birt.report.engine.extension.IRowMetaData;
import org.eclipse.birt.report.engine.extension.IRowSet;
/**
 * 
 * 
 */
public class RowSet implements IRowSet