http://code.google.com/appengine/docs/datastore/queriesandindexes.html
says
App Engine provides automatic indexes for the following forms of
queries:
queries using only equality, IN and ancestor filters
queries using only inequality filters (which can only be of a
single property)
queries with only one sort order, ascending
however, the following query results in an entry in index.yaml
WHERE user = :user
ORDER BY created_at
If I clear everything out (deleting the data store, the history file
and index.yaml and restarting), there's no index.yaml entry for the
following query
WHERE user = :user
Using "ORDER BY created_at ASC" also results in an index.yaml entry.
Why does that query with a single ascending order by require a custom
index?
Thanks,
-andy
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