After upgrading MySQL Workbench 6.2 to 6.3, my Workbench displayed Mac’s spinning wheel of death almost all the time, even with the most simple query:
SELECT * FROM ecruite.MenuItem;
The queried table consists of 4 rows with 10 columns each and approx. 10 characters each. So it should be done in no time. Except if you’re using macOS Sierra and MySQL Workbench 6.3 you get the spinning wheel.
According to a user on SO, it’s a known bug and popped up with the introduction of a new security feature in Sierra: “Gatekeeper Path Randomization“.
As long as there is no bug-fixed version of MySQL Workbench, here is a workaround until MySQL releases a new version: