PDO results with fetch style PDO::FETCH_COLUMN made available for caching

lib/Doctrine/DBAL/Cache/ArrayStatement.php

@@ -68,6 +68,10 @@ class ArrayStatement implements \IteratorAggregate, ResultStatement
                 return array_values($row);
             } else if ($fetchStyle === PDO::FETCH_BOTH) {
                 return array_merge($row, array_values($row));
+            } else if ($fetchStyle === PDO::FETCH_COLUMN) {
+                return reset($row);
+            } else {
+                throw new \InvalidArgumentException("Invalid fetch-style given for fetching result.");
             }
         }
         return false;
@@ -91,4 +95,4 @@ class ArrayStatement implements \IteratorAggregate, ResultStatement
         }
         return $row[$columnIndex];
     }
-}
+}
\ No newline at end of file

lib/Doctrine/DBAL/Cache/ResultCacheStatement.php

@@ -169,6 +169,8 @@ class ResultCacheStatement implements \IteratorAggregate, ResultStatement
                 return array_values($row);
             } else if ($fetchStyle == PDO::FETCH_BOTH) {
                 return array_merge($row, array_values($row));
+            } else if ($fetchStyle == PDO::FETCH_COLUMN) {
+                return reset($row);
             } else {
                 throw new \InvalidArgumentException("Invalid fetch-style given for caching result.");
             }