Hi,
I'm using the Java low-level Datastore API, in a local unit test (as
described here:
http://code.google.com/appengine/docs/java/howto/unittesting.htm):
I'm trying to run a prefix search on __key__ (which I generated in the
first place), as per the usual range-query hack:
q.addFilter(Entity.KEY_RESERVED_PROPERTY,
Query.FilterOperator.GREATER_THAN_OR_EQUAL, prefix);
q.addFilter(Entity.KEY_RESERVED_PROPERTY,
Query.FilterOperator.LESS_THAN, prefix + '\ufffd');
This fails to return any results. Note, that this technique works for
all other properties, just not __key__.
It's my impression that __key__ does not have a descending index by
default. So, I've tried adding this to datastore-index.xml:
<datastore-index kind="Catalog" ancestor="false">
<property name="__key__" direction="desc" />
</datastore-index>
But this had no impact. In fact, based on a quick trace, I've seen no
evidence that the GAE code invoked during the unit test even tries to
open this file.
I believe this might be a bug in the AppEngine implementation
(shouldn't an exception be thrown if there's no index on the queried
field)? Or at least something that was overlooked...
Is there a workaround?
Thanks,
Viktor
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