Many thanks Pangaj,
That is a valid work around, however this is a major bug. I am still a big fan, but this is a significant issue.
I use the database for automation and fully rely on the core Group By function.
My work around is to manually Select all the tags I need, which means I need to manually run Show Series and then modify my queries accordingly periodically. I have added my notes to your GitHub Issue entry as well. Lets hope the Influx chaps takes a look at this soon.
Thanks,
Lasse