Bug 139346 Using isTopN in table inside list group header doesn't work.
Description: Using isTopN in table inside list group header doesn't work. Steps to reproduce: 1.Insert a list with a group 2.Insert a table to list group header 3.Using Total.isTopN(row[],2,null,0) as filter expression in table item. 4.Preview Result: Only the first group displayed top 2 records, other groups kept display all records.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
}
	/*
	 * Closes the executor; release all odi resources
	 * 
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#close()
	 */
	public void close( )
	{
		if ( odiQuery == null )
		{
			
			logger.logp( Level.FINER,
					QueryExecutor.class.getName( ),
					"close",
					"executor closed " );
			return;
		}
		
	    
	    try
		{
    		dataSet.beforeClose();
		}
	    catch (DataException e )
		{
			logger.logp( Level.FINE,
					QueryExecutor.class.getName( ),
					"close",
					e.getMessage( ),
					e );