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
|| rsMeta == null || rsMeta.getColumnCount( ) == 0 )
			return true;
		List list = new ArrayList( );
		for ( Iterator iter = dataSetHandle.getCachedMetaDataHandle( )
				.getResultSet( )
				.iterator( ); iter.hasNext( ); )
		{
			list.add( iter.next( ) );
		}
		if ( list.size( ) != rsMeta.getColumnCount( ) )
			return true;
		for ( int i = 1; i <= rsMeta.getColumnCount( ); i++ )
		{
			ResultSetColumnHandle handle = (ResultSetColumnHandle) list.get( i - 1 );
			if ( !handle.getColumnName( ).equals( getColumnName( rsMeta, i ) )
					|| !handle.getDataType( )
							.equals( toModelDataType( rsMeta.getColumnType( i ) ) ) )
				return true;
		}
		return false;
	}
	
	/**
	 * 
	 * @param rsMeta
	 * @param index
	 * @return
	 * @throws BirtException
	 */
	private String getColumnName( IResultMetaData rsMeta, int index )