Hello! I recently discovered the power of merge joins on app-engine (no more composite indexes required! hurray!). I am also aware that i cannot inequality filters, neither order clauses.
But what if i generate the primary key of the entities using the values of the field i wish to order by. This way, since entities are ordered (by default) by key ascending, it means they will effectively be ordered by my criteria. I also realized that this would work only for entities with no parents. Otherwise the parent part of the key will mess things up (it is compared first and this will determine the real order! which is not what i need/want); solution -> no parents ;) Quote from compareTo() method of Key: "The relationship between individual Key Keys is performed by comparing app followed by kind followed by id. If both keys are assigned names rather than ids, compares names instead of ids. If neither key has an id or a name we return an arbitrary but consistent result. Assuming all other components are equal, all ids are less than all names. " More specifically: "if both keys are assigned names rather than ids, compares names instead of ids". Are names compared lexically? It seems so, but i want to be sure. Can you tell me? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~----------~----~----~----~------~----~------~--~---
