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/PreparedQuery.java
private static void copyExpressions(
			SubqueryDefinition srcSubQueryDefn,
			SubqueryDefinition destSubQueryDefn) throws DataException 
	{
		Map bindings = srcSubQueryDefn.getBindings( );
		Iterator it = bindings.keySet( ).iterator( );
		while ( it.hasNext( ) )
		{
			Object o = it.next( );
			destSubQueryDefn.addBinding(convertToBindings( bindings.get( o ) ));
		}
	}
	/**
	 * 
	 * @param bindings
	 * @param o
	 * @return
	 */
	private static IBinding convertToBindings( Object binding )
	{
		if( binding instanceof IBinding )
		{
			return (IBinding)binding;
		}
		else
		{
			return null;
		}
	}
	/**