Bug 206861 The data set cache should handle IOException and the cancel request from customer
The data set data will be saved into disk file in the first query and it will be loaded in the later time. The processing of write disk file may be cancelled by customer request or IOException. Using the data from the bad file will cause error.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/cache/OdiAdapter.java
/**
	 * Construction 
	 * 
	 */
	public OdiAdapter( IDataSetPopulator populator)
	{
		assert populator != null;
		this.populator = populator;
	}
	
	/**
	 * Fetch data from Oda or Odi. After the fetch is done, the cursor
	 * must stay at the row which is fetched.
	 * @return IResultObject
	 * @throws DataException
	 */
	IResultObject fetch( ) throws DataException
	{
		try
		{
			if ( odaResultSet != null )
			{
				return odaResultSet.fetch( );
			}
			if ( datasetCache != null )
			{
				return datasetCache.fetch( );
			}
			else if ( customDataSet != null )