Bug 123036 Data in a reprot is doubly stored
We currently stored data twice. Once in the content stream, once by DtE. The instance stored by content stream should not be there.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ResultIterator.java
public Blob getBlob( IBaseExpression dataExpr ) throws BirtException
	{
		return DataTypeUtil.toBlob( getValue( dataExpr ) );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getBytes(org.eclipse.birt.data.engine.api.IBaseExpression)
	 */
	public byte[] getBytes( IBaseExpression dataExpr ) throws BirtException
	{
		return DataTypeUtil.toBytes( getValue( dataExpr ) );
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#skipToEnd(int)
	 */
	public void skipToEnd( int groupLevel ) throws DataException
	{
		checkStarted( );
		odiResult.last( groupLevel );
		logger.logp( Level.FINER,
				ResultIterator.class.getName( ),
				"skipToEnd",
				"skipping rows to the last row in the current group" );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getStartingGroupLevel()
	 */
	public int getStartingGroupLevel( ) throws DataException