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
}
	/**
	 * 
	 * @param cmdHandle
	 * @return
	 * @throws BirtException
	 */
	private IResultMetaData getCachedMetaData( CachedMetaDataHandle cmdHandle )
			throws BirtException
	{
		if ( cmdHandle == null )
			return null;
		Iterator it = cmdHandle.getResultSet( ).iterator( );
		List columnMeta = new ArrayList( );
		while ( it.hasNext( ) )
		{
			ResultSetColumnHandle rsColumn = (ResultSetColumnHandle) it.next( );
			IColumnDefinition cd = this.modelAdaptor.ColumnAdaptor( rsColumn );
			columnMeta.add( cd );
		}
		return new ResultMetaData( columnMeta );
	}
	/**
	 * @param dataSetName
	 * @return
	 * @throws BirtException
	 */
	private IResultMetaData getRealMetaData( String dataSetName )
			throws BirtException
	{