Merge "Add QueryPage::delete method"

diff --combined includes/specialpage/QueryPage.php
index 223f799,1977af0..6cc6e4e
--- 1/includes/specialpage/QueryPage.php
--- 2/includes/specialpage/QueryPage.php
+++ b/includes/specialpage/QueryPage.php
@@@ -21,6 -21,7 +21,7 @@@
   * @ingroup SpecialPage
   */
  
+ use MediaWiki\Linker\LinkTarget;
  use MediaWiki\MediaWikiServices;
  use Wikimedia\Rdbms\IResultWrapper;
  use Wikimedia\Rdbms\IDatabase;
@@@ -312,7 -313,7 +313,7 @@@ abstract class QueryPage extends Specia
                                $num = $res->numRows();
                                # Fetch results
                                $vals = [];
 -                              foreach ( $res as $row ) {
 +                              foreach ( $res as $i => $row ) {
                                        if ( isset( $row->value ) ) {
                                                if ( $this->usesTimestamps() ) {
                                                        $value = wfTimestamp( TS_UNIX,
@@@ -321,7 -322,7 +322,7 @@@
                                                        $value = intval( $row->value ); // T16414
                                                }
                                        } else {
 -                                              $value = 0;
 +                                              $value = $i;
                                        }
  
                                        $vals[] = [
@@@ -375,6 -376,23 +376,23 @@@
                return wfGetDB( DB_REPLICA, [ $this->getName(), 'QueryPage::recache', 'vslow' ] );
        }
  
+       /**
+        * Remove a cached result.
+        * Useful for interactive backlogs where the user can fix problems in-place.
+        * @param LinkTarget $title The page to remove.
+        * @since 1.34
+        */
+       public function delete( LinkTarget $title ) {
+               if ( $this->isCached() ) {
+                       $dbw = wfGetDB( DB_MASTER );
+                       $dbw->delete( 'querycache', [
+                               'qc_type' => $this->getName(),
+                               'qc_namespace' => $title->getNamespace(),
+                               'qc_title' => $title->getDBkey(),
+                       ], __METHOD__ );
+               }
+       }
+ 
        /**
         * Run the query and return the result
         * @param int|bool $limit Numerical limit or false for no limit