fix(mariadb): correct the grate internal migration script - issue 569

[hoangthanh28]

• Correct the migration script, prevent grate run multiple time with the checking exists when creating grate internal.
  Ref: v1.8.0 MariaDB/MySQL fix casing scripts seem to break with MySQL #569

[hoangthanh28]

Hi @erikbra
Please help to review this PR and merge the fix for MariaDB. Looks like the current sql script is not fully compatible with older version of MySql.

Thanks.

[erikbra]

Thanks a lot, @hoangthanh28! It looks mostly good. Could you please look at my comment? And, while we're on the nit-picking - could you please fix the spelling of "exits" to "exists" in the new filenames? :)

e.g. : src/grate.mariadb/Bootstrapping/Sql/GrateStructure/up/00_02_fix_version_table_casing_if_exits.sql
to. : src/grate.mariadb/Bootstrapping/Sql/GrateStructure/up/00_02_fix_version_table_casing_if_exists.sql

other than that, this looks good, and I'm happy you solved the issue for actual MySql users (MySql seems to be dropping a bit behind MariaDb after Oracle bought it)

[erikbra]

The file names look good now, @hoangthanh28 - thanks! 😄