Bug 161222 Decoration label should be optional in Gantt Chart
It should not be mandatory to specify a decoration label for Gantt Charts, this can be left blank. Currently the UI and Engine enforce a data definition to be specified for it.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/internal/datafeed/ResultSetDataSet.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.chart.internal.datafeed;
import java.util.Iterator;
import java.util.List;
import org.eclipse.birt.chart.computation.IConstants;
import org.eclipse.birt.chart.datafeed.IResultSetDataSet;
import org.eclipse.birt.chart.internal.datafeed.ResultSetWrapper;
/**
 * Maintains a subset of a resultset by defining a selective list of columns and
 * a row range to be extracted from a full resultset. An instance of this class
 * is provided to a custom data set processor that is capable of converting the
 * resultset subset content into the expected chart dataset format.
 */
public final class ResultSetDataSet implements IResultSetDataSet
{
	/**
	 * Indexes of the columns extracted from the parent resultset