X-Git-Url: http://git.heureux-cyclage.org/?a=blobdiff_plain;f=includes%2Fapi%2FApiQueryLogEvents.php;h=962d9561300c0ff60f8c62e08cc9263e1a02516b;hb=8963110d01b0f376d900171fe7506fed5df80cf8;hp=0934ab391df6eb95a895b34eb3c1421611eb7446;hpb=747bdd543d301e0816aa811806c6cc6b17ec1038;p=lhc%2Fweb%2Fwiklou.git

diff --git a/includes/api/ApiQueryLogEvents.php b/includes/api/ApiQueryLogEvents.php
index 0934ab391d..962d956130 100644
--- a/includes/api/ApiQueryLogEvents.php
+++ b/includes/api/ApiQueryLogEvents.php
@@ -112,7 +112,7 @@ class ApiQueryLogEvents extends ApiQueryBase {
 
 		if ( !is_null( $params['tag'] ) ) {
 			$this->addTables( 'change_tag' );
-			$this->addJoinConds( [ 'change_tag' => [ 'INNER JOIN',
+			$this->addJoinConds( [ 'change_tag' => [ 'JOIN',
 				[ 'log_id=ct_log_id' ] ] ] );
 			$changeTagDefStore = MediaWikiServices::getInstance()->getChangeTagDefStore();
 			try {
@@ -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'];
@@ -234,6 +238,14 @@ class ApiQueryLogEvents extends ApiQueryBase {
 			}
 		}
 
+		// T220999: MySQL/MariaDB (10.1.37) can sometimes irrationally decide that querying `actor` before
+		// `logging` and filesorting is somehow better than querying $limit+1 rows from `logging`.
+		// Tell it not to reorder the query. But not when `letag` was used, as it seems as likely
+		// to be harmed as helped in that case.
+		if ( $params['tag'] === null ) {
+			$this->addOption( 'STRAIGHT_JOIN' );
+		}
+
 		$count = 0;
 		$res = $this->select( __METHOD__ );
 		$result = $this->getResult();