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[ticket/15941] Replace MAX SQL in functions_posting.php

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Replace MAX SQL function with faster query using order by and limit.
The ajacent query could also be optimized to eliminate the usage of MAX.
Note that adding a compound key as suggested by EXPLAIN SQL yields an
improvement, but not nearly as fast as ORDER + LIMIT.

PHPBB3-15941
This commit is contained in:
jasonmarlin
2019-01-17 20:27:10 -05:00
parent cffdc8efff
commit a0f1ec852a
1 changed files with 1 additions and 1 deletions
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phpBB/includes/functions_posting.php
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@@ -200,7 +200,7 @@ function update_post_information($type, $ids, $return_update_sql = false)
$topic_condition = '';
}
if (count($ids) == 1)
if (count($ids) === 1)
{
$sql = 'SELECT p.post_id as last_post_id
FROM ' . POSTS_TABLE . " p $topic_join