Increase size of the language column in language_stat

[zeripath]

In #12379 it was discovered that enry v2 has a maximum language length
of 34 characters which is larger than the 30 previously provided.

This PR updates the language column to 50.

Fix #12379
Fix #13013

Signed-off-by: Andrew Thornton art27@cantab.net

[zeripath]

So actually thinking on, because sqlite doesn't need to change schema - varchar is mapped to text - I think we might be able to get away with just using ALTER TABLE in this case.

I'll keep this code though and add a doctor command that will allow you to recreate tables from the schema - that will finally allow us to be able to get rid of the weird warning messages about defaults having changed.

[zeripath]

Finally I think I've solved (again) all the issues with the different dialects.

[lafriks]

Would be nice if this code could be moved to function like rename column but otherwise looks good

[zeripath]

@lafriks unfortunately a general solution is not very easy at all. In particular SQLite poses a particular problem here.

SQLite doesn't have a mechanism for changing the type of a column and you can't create a column with a unique not null constraint on an already existing table. So you're limited to copying the table and adding the column.

In reality the simplest thing to do is to recreate the table in its entirety from bean definition - I've provided that as another PR.

A general method that keeps the previous columns would be possible but I suspect that it may not be worth it.

[lunny]

Otherwise LGTM

[zeripath]

make lg-tm work

[silverwind]

Hmm it seems this migration is giving me some trouble against MariaDB:

routers/init.go:71:initDBEngine() [I] ORM engine initialization attempt #3/10...
...rm/session_schema.go:25:Ping() [I] PING DATABASE mysql
...ations/migrations.go:310:Migrate() [I] Migration[145]: Increase Language field to 50 in LanguageStats
routers/init.go:77:initDBEngine() [E] ORM engine initialization attempt #3/10 failed. Error: migrate: do migrate: Error 1062: Duplicate entry 'JavaScript' for key 'UQE_language_stat_s'
routers/init.go:78:initDBEngine() [I] Backing off for 3 seconds

mysql  Ver 15.1 Distrib 10.4.13-MariaDB, for Linux (x86_64) using readline 5.1