Summary:
Ref T1191. Although I fixed some of the mutations earlier (in D10598), I missed the column mutations under old versions of MySQL. In particular, this isn't valid:
- `ALTER TABLE ... MODIFY columnName VARCHAR(64) COLLATE binary`
Issue the permitted version of this instead, which is:
- `ALTER TABLE ... MODIFY columnName VARBINARY(64)`
Also fixed an issue where a clean schema had the wrong nullability for a column in the draft table. Force it to the expected nullability.
The other trick here is around the one column with a FULLTEXT index on it, which needs a little massaging.
Test Plan:
- Forced my local install to return `false` for utf8mb4 support.
- Did a clean adjust into `binary` columns.
- Poked around, added emoji to things.
- Reverted the fake check and did a clean adjust into `utf8mb4` columns.
- Emoji survived.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: fabe, epriestley
Maniphest Tasks: T1191
Differential Revision: https://secure.phabricator.com/D10627
