Bug 196745 Data Engine implementation of BPS80- Result Set Sharing
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ResultIterator.java
* @return
	 */
	private File getMetaCacheFile( )
	{
		File file = new File(context.getTmpdir()
				+ CACHED_FILE_PREFIX
				+ resultService.getQueryResults().getID()+"meta");
		return file;
	}
	
	/**
	 * 
	 * @return
	 */
	private File getRowCacheFile( )
	{
		File file = new File(context.getTmpdir()
				+ CACHED_FILE_PREFIX
				+ resultService.getQueryResults().getID()+"row");
		return file;
	}
	
	/**
	 * 
	 * @throws DataException
	 * @throws IOException 
	 */
	private void saveMetaData( ) throws DataException, IOException
	{
		Map metaMap = new HashMap( );