Issue #2797141 by Driskell, daffie, andypost, Charlie ChX Negyesi,...

    return preg_replace('/; InnoDB free:.*$/', '', $comment);

  }

  /**

   * {@inheritdoc}

   */

  public function tableExists($table) {

    // The information_schema table is very slow to query under MySQL 5.0.

    // Instead, we try to select from the table in question.  If it fails,

    // the most likely reason is that it does not exist. That is dramatically

    // faster than using information_schema.

    // @link http://bugs.mysql.com/bug.php?id=19588

    // @todo This override should be removed once we require a version of MySQL

    //   that has that bug fixed.

    try {

      $this->connection->queryRange("SELECT 1 FROM {" . $table . "}", 0, 1);

      return TRUE;

    }

    catch (\Exception $e) {

      return FALSE;

    }

  }

  /**

   * {@inheritdoc}

   */

  public function fieldExists($table, $column) {

    // The information_schema table is very slow to query under MySQL 5.0.

    // Instead, we try to select from the table and field in question. If it

    // fails, the most likely reason is that it does not exist. That is

    // dramatically faster than using information_schema.

    // @link http://bugs.mysql.com/bug.php?id=19588

    // @todo This override should be removed once we require a version of MySQL

    //   that has that bug fixed.

    try {

      $this->connection->queryRange("SELECT $column FROM {" . $table . "}", 0, 1);

      return TRUE;

    }

    catch (\Exception $e) {

      return FALSE;

    }

  }

}

/**