Bug 136973 Refresh problem-column name in chart builder
Description: Use flat file datasource, if change the column name in flat file, the column name will changed in data explorer but not refreshed in chart builder accordingly. Only restart Eclipse will get the correct information.
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/impl/DataSetMetaDataHelper.java
*/
	DataSetMetaDataHelper( DataEngine dataEngine, IModelAdapter modelAdaptor,
			ModuleHandle moduleHandle )
	{
		this.dataEngine = dataEngine;
		this.modelAdaptor = modelAdaptor;
		this.moduleHandle = moduleHandle;
	}
	/**
	 * 
	 * @param dataSetHandle
	 * @param useCache
	 * @return
	 * @throws BirtException
	 */
	IResultMetaData getDataSetMetaData( DataSetHandle dataSetHandle,
			boolean useCache ) throws BirtException
	{
		if ( dataSetHandle == null )
		{
			throw new AdapterException( ResourceConstants.DATASETHANDLE_NULL_ERROR );
		}
		if ( useCache )
		{
			return getCachedMetaData( dataSetHandle.getCachedMetaDataHandle( ) );
		}
		else
		{
			return getRealMetaData( dataSetHandle.getName( ) );
		}