Bug 182061 Data engine changes to support result set sharing
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedQuery.java
this.exprManager.addBindingExpr( key, resultSetExpressions, groupLevel );
		
		
		Collection subQueries = trans.getSubqueries( );
		Iterator subIt = subQueries.iterator( );
		while ( subIt.hasNext( ) )
		{
			ISubqueryDefinition subquery = (ISubqueryDefinition) subIt.next( );
			PreparedSubquery pq = new PreparedSubquery( this.session, this.dataEngineContext,
					subquery,
					queryService,
					groupLevel );
			subQueryMap.put( subquery.getName(), pq);
			
			subQueryDefnMap.put( subquery.getName( ), new Object[]{
					subquery, new Integer( groupLevel )
			} );
		}
	}
	
	/**
	 * Prepares all expressions in the given collection
	 * 
	 * @param expressions
	 * @param groupLevel
	 * @param afterGroup
	 * @param cx
	 * @throws DataException 
	 */
	private void prepareExpressions( Collection expressions, int groupLevel,