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[CORE][DATABASE] Another approach to semi-join in the inboxnoticestream query

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Compared to the solution with INNER JOIN this seems to have better performance
as there is no need to deduplicate the subquery result before use.
This commit is contained in:
Alexei Sorokin 2020-06-10 14:21:47 +03:00 committed by Diogo Peralta Cordeiro
parent ed4cc01b2f
commit a93c38a9af
1 changed files with 14 additions and 11 deletions
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25
lib/notices/inboxnoticestream.php
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@ -93,22 +93,25 @@ class RawInboxNoticeStream extends FullNoticeStream
// Subscription:: is a table of subscriptions (every user is subscribed to themselves)
$notice->_join .= sprintf(
"\n" . <<<'END'
INNER JOIN (
(SELECT id FROM notice
WHERE profile_id
IN (SELECT subscribed FROM subscription WHERE subscriber = %1$d))
UNION
(SELECT notice_id AS id FROM reply WHERE profile_id = %1$d)
UNION
(SELECT notice_id AS id FROM attention WHERE profile_id = %1$d)
UNION
(SELECT notice_id AS id FROM group_inbox INNER JOIN group_member USING (group_id)
WHERE group_member.profile_id = %1$d)
LEFT JOIN (
SELECT notice.id
FROM notice INNER JOIN subscription
ON notice.profile_id = subscription.subscribed
WHERE subscription.subscriber = %1$d
UNION ALL
SELECT notice_id AS id FROM reply WHERE profile_id = %1$d
UNION ALL
SELECT notice_id AS id FROM attention WHERE profile_id = %1$d
UNION ALL
SELECT notice_id AS id FROM group_inbox INNER JOIN group_member USING (group_id)
WHERE group_member.profile_id = %1$d
) AS t1 USING (id)
END,
$this->target->getID()
);
$notice->whereAdd('t1.id IS NOT NULL');
$notice->whereAdd(sprintf(
"notice.created > TIMESTAMP '%s'",
$notice->escape($this->target->created)