Optimize feed query
Summary:
This was killing us. EXPLAIN after:
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
|---|---|---|---|---|---|---|---|---|---|
| 1 | SIMPLE | story | index | chronologicalKey | chronologicalKey | 8 | 201 | ||
| 1 | SIMPLE | ref | ref | chronologicalKey | chronologicalKey | 8 | phabricator_feed.story.chronologicalKey | 1 | Using index |
Test Plan: /feed/
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D3628