Bug 201396 Exception is thrown out when a chart use the list shared result set [0005]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryResults.java
return this.prototype.getResultSetCache( );
		}
		public int getRowCount( ) throws DataException
		{
			return 1;
		}
		public int getStartingGroupLevel( ) throws DataException
		{
			return 0;
		}
		public void last( int groupingLevel ) throws DataException
		{
			this.prototype.last( groupingLevel );
		}
		public boolean next( ) throws DataException
		{
			if ( !this.isFirstRowFetched )
			{
				this.isFirstRowFetched = true;
				return true;
			}
			return false;
		}
	}
	/**
	 * 
	 * @author Administrator
	 *
	 */
	private class DummyResultIterator extends ResultIterator