Migrations hang when "default=" is set on a new field, while USING HASH.

What works.

First time table creation, and most other migrations work fine.

What does not work.

Migrations hang when default= is set on a new field, while USING HASH in the table.

message = models.TextField(default='') # Hangs migration.
message2 = models.TextField(null=True) # Works.

Issue Details

This issue is mentioned here: https://github.com/django/django/blob/7e3c9c3205e9646261cea5e5a7af7ec0e806690a/docs/ref/migration-operations.txt#L163

I believe, when the migration has to perform a full rewrite of the table, Django cannot understand crdb_internal_id_shard_16 (or how it fits into the model) when USING HASH is specified.

Possible resolution

Is there a way to ignore or hide fields which CockroachDB generates automatically when using hash sharded index?

If we can get Django to simply ignore anything of crdb_internal_* we could be okay.

Related: 78049 https://github.com/cockroachdb/django-cockroachdb/issues/264

[rafiss]

Thanks for this report! Could you share the way of reproducing the bug using only cockroach sql? And file an issue at https://github.com/cockroachdb/cockroach (or post here, and I can file it for you).

[timgraham]

Great, thanks. Closing as “not completed” since it’s not applicable to this repo.