It looks to me like you have the query reversed. Page contains a list of
aliases, and you're looking to filter on Page entities to try to match all
Page entities that have the target alias in the list. That is, say a page
has the aliases "red" and "blue" - you'd want the code to return that page
if you executed a query on "red". Here's the code you want:
query = pm.newQuery(Page.class);
query.setFilter("aliases == alias");
query.declareVariables("String alias");
List<Page> results = (List<Page>)query.execute("red");
Filtering for collection inclusion is just an equality filter. To read more
about this, check this out:
http://code.google.com/appengine/docs/java/datastore/queriesandindexes.html
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