ApiQueryLogEvents: Add IGNORE INDEX to avoid MariaDB optimizer bug

[lhc/web/wiklou.git] / includes / api / ApiQueryLogEvents.php

diff --git a/includes/api/ApiQueryLogEvents.php b/includes/api/ApiQueryLogEvents.php
index 0934ab3..7d74c07 100644 (file)
--- a/includes/api/ApiQueryLogEvents.php
+++ b/includes/api/ApiQueryLogEvents.php
@@ -183,6 +183,10 @@ class ApiQueryLogEvents extends ApiQueryBase {
                                $db, 'log_user', User::newFromName( $params['user'], false )
                        );
                        $this->addWhere( $q['conds'] );
+
+                       // T71222: MariaDB's optimizer, at least 10.1.37 and .38, likes to choose a wildly bad plan for
+                       // some reason for this code path. Tell it not to use the wrong index it wants to pick.
+                       $this->addOption( 'IGNORE INDEX', [ 'logging' => [ 'times' ] ] );
                }
 
                $title = $params['title'];