Bug 201013 [Automation][Regression]Invalid group key column name: _{$TEMP_GROUP_1$} occurs when preview attached report[1102]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/dscache/CandidateQuery.java
return getOdaCacheResultSet( ).getResultClass( );
	}
	/*
	 * @see org.eclipse.birt.data.engine.odi.ICandidateQuery#execute()
	 */
	public IResultIterator execute( IEventHandler eventHandler ) throws DataException
	{
		return new CachedResultSet( this,
				getOdaCacheResultSet( ).getResultClass( ),
				getOdaCacheResultSet( ),
				eventHandler, session );
	}
	/*
	 * @see org.eclipse.birt.data.engine.odi.ICandidateQuery#setCandidates(org.eclipse.birt.data.engine.odi.IResultIterator,
	 *      int)
	 */
	public void setCandidates( IResultIterator resultObjsIterator,
			int groupingLevel ) throws DataException
	{
		
	}
	/*
	 * @see org.eclipse.birt.data.engine.odi.ICandidateQuery#setCandidates(org.eclipse.birt.data.engine.odi.ICustomDataSet)
	 */
	public void setCandidates( ICustomDataSet customDataSet )
			throws DataException
	{
		
	}