Marostegui added a comment.

  I have been talking to @Anomie about this issue, and it is believed that it 
doesn't seem to be the same thing as T221458 
<https://phabricator.wikimedia.org/T221458> or T220999 
<https://phabricator.wikimedia.org/T220999>, but it is related to the `actor` 
change. 
  Looks like that for the where on `rev_timestamp>='20190418104744` it could 
use the denormalized `revactor_timestamp` field to filter the `temp_rev_user` 
line.
  @Anomie thinks that there are two potential fixes:
  
  - change the WHERE clause to reference the denormalized field directly
  - change the JOIN to add a redundant equality `revactor_timestamp = 
rev_timestamp` which seems to work to let it know it can propagate the WHERE 
condition to the denormalized field.
  
  Eventually the `revision_actor_temp` will be killed once the migration is 
fully done, but that is not going to happen soonish.

TASK DETAIL
  https://phabricator.wikimedia.org/T221380

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To: Marostegui
Cc: Marostegui, Anomie, Daimona, matej_suchanek, MisterSynergy, Framawiki, 
TerraCodes, Liuxinyu970226, Aklapper, Jc86035, alaa_wmde, DannyS712, Nandana, 
Banyek, Rayssa-, Lahi, Gq86, Darkminds3113, Lsherwinforone, GoranSMilovanovic, 
Jayprakash12345, QZanden, LawExplorer, Vali.matei, Sethakill, _jensen, 
rosalieper, Volker_E, Wong128hk, Wikidata-bugs, aude, GWicke, Dinoguy1000, 
Jdforrester-WMF, Mbch331, Jay8g, Krenair
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