Bug 134665 report become dirty after previewing data set
steps to reproduce: - create a report - create a data source - create a data set - save the report - open the data set - preview results expected behavior: - the state of the report remains unchanged actual behavior: - the state of the report changed, as the report became dirty
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/impl/DataSetMetaDataHelper.java
{
			return getRealMetaData( dataSetHandle.getName( ) );
		}
	}
	/**
	 * 
	 * @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
	 */