GORM Playground Link

go-gorm/playground#608

Description

I have an existing database and consistently run Automigrate but after upgrading my gorm version from 1.28.3, the automigrate is creating different unique indexes than the ones I have defined and already exist in my database.

To reproduce, pull this branch and run GORM_DIALECT=postgres go test. This should work and pass tests. But if you run it again, it will fail to make migrations because it is trying to create a uniqueIndex and uniqueConstraint that doesn't have the same name or where clause as the unique index that I defined:
ERROR: could not create unique index "idx_users_description" (SQLSTATE 23505)

After the initial run of AutoMigrate the unique indexes that I defined are correctly created:

But after the next time I run AutoMigrate, it created new unique indexes with a different name and without the where clause:

I can only get to the state of the second picture if I don't have any data that conflicts the where clause of the unique index of the description column. In my use case, I have a table with a unique index with a where deleted_at is NULL condition but now that my AutoMigrate behaves differently, I cannot run migrations.

Did something change with how AutoMigrate handles unique indexes?