commit 3929afde229ea287092da33d6c91fe9f54df9606
Author: Matthew Radcliffe <mradcliffe@softpixel.com>
Date:   Fri Aug 16 18:13:40 2013 -0500

    Issue #2001350 by mradcliffe: Add comments to the band-aid fix for cache_menu, cache_block.

diff --git a/core/lib/Drupal/Core/Cache/DatabaseBackend.php b/core/lib/Drupal/Core/Cache/DatabaseBackend.php
index d8402ae..a827cc9 100644
--- a/core/lib/Drupal/Core/Cache/DatabaseBackend.php
+++ b/core/lib/Drupal/Core/Cache/DatabaseBackend.php
@@ -210,6 +210,9 @@ public function deleteMultiple(array $cids) {
       while (count($cids));
     }
     catch (\Exception $e) {
+      // Create the cache table, which will be empty. This fixes cases during
+      // core install where a cache table is cleared before it is set
+      // with {cache_block} and {cache_menu}.
       if (!$this->ensureBinExists()) {
         $this->catchException($e);
       }
@@ -244,6 +247,9 @@ public function deleteAll() {
       $this->connection->truncate($this->bin)->execute();
     }
     catch (\Exception $e) {
+      // Create the cache table, which will be empty. This fixes cases during
+      // core install where a cache table is cleared before it is set
+      // with {cache_block} and {cache_menu}.
       if (!$this->ensureBinExists()) {
         $this->catchException($e);
       }