Bug 196745 Data Engine implementation of BPS80- Result Set Sharing
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/CacheResultIterator.java
currRowIndex++;
		if ( currRowIndex < rowCount )
		{
			readCurrentRow( );
			return true;
		}
		return false;
	}
	/**
	 * 
	 * @throws DataException
	 */
	private void readCurrentRow( ) throws DataException
	{
		try
		{
			rowIndex = IOUtil.readInt( rowInputStream );
			startingGroupLevel = IOUtil.readInt( rowInputStream );
			endingGroupLevel = IOUtil.readInt( rowInputStream );
			columnValueMap.clear( );
			for ( int i = 0; i < columnList.size( ); i++ )
			{
				columnValueMap.put( columnList.get( i ),
						IOUtil.readObject( rowInputStream ) );
			}
		}
		catch ( IOException e )
		{
			throw new DataException( ResourceConstants.READ_CACHE_TEMPFILE_ERROR );
		}