I have a large-ish query which is taking ~10 seconds to run, but I can
get it down to less than a second by changing the group by part of the
query from

    GROUP BY `refunds_userprofile`.`ird_number` ,
`auth_user`.`first_name` , `auth_user`.`last_name` ,
`refunds_userprofile`.`user_id` , `auth_user`.`id` ,
`auth_user`.`username` , `auth_user`.`first_name` ,
`auth_user`.`last_name` , `auth_user`.`email` ,
`auth_user`.`password` , `auth_user`.`is_staff` ,
`auth_user`.`is_active` , `auth_user`.`is_superuser` ,
`auth_user`.`last_login` , `auth_user`.`date_joined`

to

    GROUP BY `refunds_userprofile`.`ird_number`

(note this doesn't change the query results)

I figured I might have to use some undocumented methods to do this,
but I couldn't figure it out - I've tried explicitly setting the
query.group_by attribute with no success. Does anyone know how I could
do this?

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