this.rowSaveUtil = new RowSaveUtil( rowCount, rowExprsOs, rowLenOs );
this.rowSaveUtil = new RowSaveUtil( rowCount, rowExprsOs, rowLenOs, this.getExprNameSet( ) );
	private void initSaveRowUtil( ) throws DataException	{		rowExprsOs = streamManager.getOutStream( DataEngineContext.EXPR_VALUE_STREAM,				StreamManager.ROOT_STREAM,				StreamManager.SELF_SCOPE );		rowLenOs = streamManager.getOutStream( DataEngineContext.EXPR_ROWLEN_STREAM,				StreamManager.ROOT_STREAM,				StreamManager.SELF_SCOPE );		this.rowSaveUtil = new RowSaveUtil( rowCount, rowExprsOs, rowLenOs );	}