Upgrade CiviCRM 4.6.20 to 4.7.10 on Drupal - db error
I may have found a solution elsewhere - which is ugly and requires editing the upgrade scripts. Database Error When Upgrading 4.6 to 4.7 on Drupal 7
So it's not really a solution for me - but maybe it will be  a  solution for others, as once I got past that issue the 4.6.20 to 4.7.0alpha3 portion failed with the following. Have not found that many google matches for this error - but hopefully I can get past this next hurdle. Hopefully others won't also run into this issue.

[Error: undefined]
Exception: &quot;A fatal error was triggered: Could not find valid value
for qrid&quot;
0 /home/kialis/zootownarts.org/drupal7/sites/all/modules/civicrm/CRM/Utils/Request.php(92):
CRM_Core_Error::fatal(&quot;Could not find valid value for qrid&quot;)
1 /home/kialis/zootownarts.org/drupal7/sites/all/modules/civicrm/CRM/Queue/Page/AJAX.php(47):
CRM_Utils_Request::retrieve(&quot;qrid&quot;, &quot;String&quot;, NULL, TRUE, NULL,
&quot;POST&quot;)
2 /home/kialis/zootownarts.org/drupal7/sites/all/modules/civicrm/CRM/Queue/ErrorPolicy.php(106):
CRM_Queue_Page_AJAX::{closure}()
3 /home/kialis/zootownarts.org/drupal7/sites/all/modules/civicrm/CRM/Queue/Page/AJAX.php(54):
CRM_Queue_ErrorPolicy-&gt;call(Object(Closure))
4 internal function: CRM_Queue_Page_AJAX::runNext()
5 /home/kialis/zootownarts.org/drupal7/sites/all/modules/civicrm/CRM/Core/Invoke.php(278):
call_user_func((Array:2))
6 /home/kialis/zootownarts.org/drupal7/sites/all/modules/civicrm/CRM/Core/Invoke.php(86):
CRM_Core_Invoke::runItem((Array:13))
7 /home/kialis/zootownarts.org/drupal7/sites/all/modules/civicrm/CRM/Core/Invoke.php(54):
CRM_Core_Invoke::_invoke((Array:5))
8 /home/kialis/zootownarts.org/drupal7/sites/all/modules/civicrm/drupal/civicrm.module(454):
CRM_Core_Invoke::invoke((Array:5))
9 internal function: civicrm_invoke(&quot;upgrade&quot;, &quot;queue&quot;, &quot;ajax&quot;, &quot;runNext&quot;)
10 /home/kialis/zootownarts.org/drupal7/includes/menu.inc(527): call_user_func_array(&quot;civicrm_invoke&quot;, (Array:4))
11 /home/kialis/zootownarts.org/drupal7/index.php(21): menu_execute_active_handler()
12 {main}