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Refactor `response_to_recipient?` CTE (#17899) 

* Optimize and clean up `response_to_recipient?` CTE

Marginally improve performances, and make the CTE much more readable

* Limit max depth in `response_to_recipient?` CTE
pull/17907/head
Claire 2022-03-30 10:26:51 +02:00 committed by GitHub
parent 2de5128e66
commit 2cc7ba2671
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1 changed files with 8 additions and 32 deletions
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40
app/services/notify_service.rb
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@ -48,47 +48,23 @@ class NotifyService < BaseService
return false if @notification.target_status.in_reply_to_id.nil? return false if @notification.target_status.in_reply_to_id.nil?
# Using an SQL CTE to avoid unneeded back-and-forth with SQL server in case of long threads # Using an SQL CTE to avoid unneeded back-and-forth with SQL server in case of long threads
!Status.count_by_sql([<<-SQL.squish, id: @notification.target_status.in_reply_to_id, recipient_id: @recipient.id, sender_id: @notification.from_account.id]).zero? !Status.count_by_sql([<<-SQL.squish, id: @notification.target_status.in_reply_to_id, recipient_id: @recipient.id, sender_id: @notification.from_account.id, depth_limit: 100]).zero?
WITH RECURSIVE ancestors(id, in_reply_to_id, replying_to_sender, path) AS ( WITH RECURSIVE ancestors(id, in_reply_to_id, mention_id, path, depth) AS (
SELECT SELECT s.id, s.in_reply_to_id, m.id, ARRAY[s.id], 0
s.id,
s.in_reply_to_id,
(CASE
WHEN s.account_id = :recipient_id THEN
EXISTS (
SELECT *
FROM mentions m
WHERE m.silent = FALSE AND m.account_id = :sender_id AND m.status_id = s.id
)
ELSE
FALSE
END),
ARRAY[s.id]
FROM statuses s FROM statuses s
LEFT JOIN mentions m ON m.silent = FALSE AND m.account_id = :sender_id AND m.status_id = s.id
WHERE s.id = :id WHERE s.id = :id
UNION ALL UNION ALL
SELECT SELECT s.id, s.in_reply_to_id, m.id, st.path || s.id, st.depth + 1
s.id,
s.in_reply_to_id,
(CASE
WHEN s.account_id = :recipient_id THEN
EXISTS (
SELECT *
FROM mentions m
WHERE m.silent = FALSE AND m.account_id = :sender_id AND m.status_id = s.id
)
ELSE
FALSE
END),
st.path || s.id
FROM ancestors st FROM ancestors st
JOIN statuses s ON s.id = st.in_reply_to_id JOIN statuses s ON s.id = st.in_reply_to_id
WHERE st.replying_to_sender IS FALSE AND NOT s.id = ANY(path) LEFT JOIN mentions m ON m.silent = FALSE AND m.account_id = :sender_id AND m.status_id = s.id
WHERE st.mention_id IS NULL AND NOT s.id = ANY(path) AND st.depth < :depth_limit
) )
SELECT COUNT(*) SELECT COUNT(*)
FROM ancestors st FROM ancestors st
JOIN statuses s ON s.id = st.id JOIN statuses s ON s.id = st.id
WHERE st.replying_to_sender IS TRUE AND s.visibility = 3 WHERE st.mention_id IS NOT NULL AND s.visibility = 3
SQL SQL
end end