R1:72dec7cd2507

Faster Query for Differential Updates

Summary:
The old query was effectively

SELECT DISTINCT revision.* FROM `differential_revision` revision
JOIN `differential_relationship` relationship ON
(relationship.revisionID = revision.id
AND relationship.objectPHID in
('PHID-USER-a113b9ae4ee9524d0a20'))
OR revision.authorPHID = 'PHID-USER-a113b9ae4ee9524d0a20'
LEFT JOIN `differential_viewtime` viewtime ON
viewtime.viewerPHID in ('PHID-USER-a113b9ae4ee9524d0a20')…