Deprecate the mysql package in favor of engine/dolphin

[kyleconroy]

The current MySQL support is implemented as a totally separate package. The support in that package is incomplete; many queries that work in PostgreSQL fail for MySQL. When improvements are made to the compiler, code generation, or type-checking, the mysql package doesn't benefit. The replacement package, engine/dolphin, is coming along nicely. It's implemented using the same code as the PostgreSQL and (experimental) SQLite support.

The roadmap will be as follows:

• v1.5.0
  • mysql: no changes
  • engine/dolphin: available via the mysql:beta engine
• v1.6.0
  • mysql: deprecated, available via the mysql:deprecated engine
  • engine/dolphin: default when using the mysql engine
• v1.7.0
  • mysql: removed

[torrayne]

Do you have any idea when v1.5.0 will be ready?

[kyleconroy]

I had hoped to release it this week, but I think I need another week to get the engine/dolphin package ready for general use