Implement Query.map and Query.map_async.
#218
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+120
−33
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Fixes #210 .
A couple of features didn't come along with this implementation:
The
pass_batch_into_callbackargument: This wouldn't make a lot of sense in a query that uses an in-memory post filter and is impossible to do in MultiQuery (a logical query that merges the results of more than one Datastore query). While we could conceivably implement this in the case where a query maps directly onto a Datastore query, the details of the batching seem like an implementation detail that needn't really be exposed to the user. The utility of such a feature is uncertain, as well.The
merge_futureargument: This seems to be difficult enough to use that it likely isn't being used. The uses cases it seems to be targeting could probably be better handled by adding some user friendly methods, likeQuery.reduceorQuery.map_iter. At this time we are not aware of anyone using this or needing a work-around.