Bug 195970 Two issues when evaluate a query inlcuding a subquery[07]
Description: Currently, when evaluating a query which includes a subquery, the query will be evaluated twice. The binding of query will pass to subquery twice. If user write a java script such as new Date() and i++. The result of query will be incorrect. Another issue: when write the report document, the binding of query will be written twice and the performance is not good to evalulate it twice.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedSubquery.java
{
	private int groupLevel;
	private PreparedQuery preparedQuery;
	private IPreparedQueryService queryService;
	private DataEngineSession session;
	private boolean subQueryOnGroup;
	
	private static Logger logger = Logger.getLogger( PreparedSubquery.class.getName( ) );
	
	/**
	 * @param subquery
	 *            Subquery definition
	 * @param parentQuery
	 *            Parent query (which can be a subquery itself, or a
	 *            PreparedReportQuery)
	 * @param groupLevel
	 *            Index of group in which this subquery is defined within the
	 *            parent query. If 0, subquery is defined outside of any groups.
	 * @throws DataException
	 */
	PreparedSubquery( DataEngineSession session, DataEngineContext context,