Fix #610 - Add the missing options to handle in the context of ALTER TABLE statement: "UNIQUE" and "UNIQUE KEY"

[niconoe-]

Fix #610 by adding the missing options to handle in the context of ALTER TABLE statement: "UNIQUE" and "UNIQUE KEY".

[niconoe-]

I fixed this in the 5.11.x. Would it be possible to have it on 5.10.x too? If yes, should I provide another PR from the 5.10.x branch?

PR forced-push since 5.10.x now. Thanks.

[williamdes]

I fixed this in the 5.11.x. Would it be possible to have it on 5.10.x too? If yes, should I provide another PR from the 5.10.x branch?

You can hard reset on 5.10, cherry pick your work and force push it. Then edit the PR for 5.10.
Then it can be merged to all versions above