Steve Howell 3b338ec32e performance: Optimize filter_stream_authorization. ...

We no longer do O(N) queries to get existing streams.

This is a somewhat contrived use case--generally, we
are not trying to re-subscribe a user to several
streams.  Still, we want to avoid this.

This commit also makes `test_bulk_subscribe_many`
do more work, and the change to the test helped
me discover this bug.

2020-10-13 18:54:55 -04:00

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