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/QueryExecutionHelper.java
{
			IBaseDataSourceDesign dsourceDesign = this.modelAdaptor.adaptDataSource( dataSourceHandle );
			dataEngine.defineDataSource( dsourceDesign );
		}
		if ( handle instanceof JointDataSetHandle )
		{
			defineSourceDataSets( (JointDataSetHandle) handle );
		}
		dataEngine.defineDataSet( this.modelAdaptor.adaptDataSet( handle ) );
	}
	/**
	 * @param dataSet
	 * @param dataSetDesign
	 * @throws BirtException
	 */
	private void defineSourceDataSets( JointDataSetHandle jointDataSetHandle )
			throws BirtException
	{
		List dataSets = jointDataSetHandle.getDataSetNames( );
		for( int i = 0; i < dataSets.size( ); i++ )
		{
			DataSetHandle dsHandle = jointDataSetHandle.getModuleHandle( ).findDataSet( dataSets.get( i ).toString( ) ); 
			if ( dsHandle != null )
			{
				defineDataSet( dsHandle );
			}
		}
	}
}