Varchar

[juanjux]

Fixes #824.

Switch some types to VARCHAR with a size, mostly those of know length or maximum length like hashes (40), entry_modes (16), and emails (254 according to the last RFC). Probably some types like paths, repository_ids and URLS could be switched too, but we should choose a "safe" length for those. One option is to check the length used in git source code; I did that for a couple like the git message length but it used size_t.

• I updated the documentation explaining the new behavior if any.
• I updated CHANGELOG.md file adding the new feature or bug fix.
• I updated go-mysql-server using make upgrade command if applicable.
• I added or updated examples if applicable.
• I checked that changes on schema are reflected into the documentation, if applicable.

[kuba--]

rebase, please

[ajnavarro]

@juanjux could you check tests please?

[juanjux]

@ajnavarro I don't know wtf is happening with the Travis build and the TestBuildSquashedTable test because, of course, It Works On My Machine ™️ but I'm investigating.

[juanjux]

Could reproduce the problem by going to the specific directory of the test. Now I just need to understand wtf those numbers differ.

[erizocosmico]

Can you rebase?

[juanjux]

@erizocosmico fifth rebase done 🥇 the bug in the test should be fixed now @ajnavarro so it should be ready to merge if Travis works.

[juanjux]

Ok, it failed again, daaaamn

[juanjux]

Worked, @ajnavarro can I have a sweet merge?

[ajnavarro]

The schema and docu changed too! well done!