Avoid stupid mariadb filesort in findMissingFiles.php

Change-Id: I6267cfaf375fcc0eea8291fd7a2a0f7daa05a941

diff --git a/maintenance/findMissingFiles.php b/maintenance/findMissingFiles.php
index 67864c5..add7108 100644 (file)
--- a/maintenance/findMissingFiles.php
+++ b/maintenance/findMissingFiles.php
@@ -59,11 +59,13 @@ class FindMissingFiles extends Maintenance {
                do {
                        $res = $dbr->select(
                                array_merge( array( 'page' ), $joinTables ),
-                               array( 'name' => 'DISTINCT(page_title)' ),
+                               array( 'name' => 'img_name' ),
                                array( 'page_namespace' => NS_FILE,
                                        "page_title >= " . $dbr->addQuotes( $lastName ) ),
                                __METHOD__,
-                               array( 'ORDER BY' => 'page_title', 'LIMIT' => $this->mBatchSize ),
+                               // DISTINCT causes a pointless filesort
+                               array( 'ORDER BY' => 'name', 'GROUP BY' => 'name',
+                                       'LIMIT' => $this->mBatchSize ),
                                $joinConds
                        );