Ticket #35075: 35075.2.patch

src/wp-includes/class-wp-comment-query.php

@@ -362 +362 @@
                         $this->meta_query_clauses = $this->meta_query->get_sql( 'comment', $wpdb->comments, 'comment_ID', $this );
                 }
 
-                // $args can include anything. Only use the args defined in the query_var_defaults to compute the key.
-                $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) );
+                /**
+                 * Filter the keys used to determine the comment cache.
+                 *
+                 * @since 4.5.0
+                 *
+                 * @param array           $cache_keys   keys that will be used in the query_vars to cache the comment
+                 */
+    $cache_keys = apply_filters('comment_cache_keys', array_keys( $this->query_vars ) );
+                $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, $cache_keys ) ) );
                 $last_changed = wp_cache_get( 'last_changed', 'comment' );
                 if ( ! $last_changed ) {
                         $last_changed = microtime();