Bug 192332 Engine does not set values for parameters in a data extraction task
Engine does not set values for parameters in a data extraction task. So if a query binds a paramter, we can not get correct data from document.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/DataExtractionTaskV1.java
assert displayName != null;
		prepareMetaData( );
		if ( displayName.startsWith( "InstanceId:" ) )
		{
			resultSetName = null;
			instanceId = InstanceID.parse( displayName.substring( 11 ) );
		}
		else
		{
			resultSetName = displayName;
			instanceId = null;
		}
		selectedColumns = null;
	}
	public List getMetaData( ) throws EngineException
	{
		return getResultSetList( );
	}
	public List getResultSetList( ) throws EngineException
	{
		prepareMetaData( );
		if ( instanceId != null )
		{
			ArrayList rsetList = new ArrayList( );
			IResultMetaData metaData = getMetaDateByInstanceID( instanceId );
			if ( metaData != null )
			{
				rsetList.add( new ResultSetItem( "InstanceId:"
						+ instanceId.toUniqueString( ), metaData ) );
			}