refactor(register): remove deprecated register method

[gforsyth]

refactor(register): remove deprecated register method

BREAKING CHANGE: The deprecated register method has been removed.
Please use the file-specific read_* methods instead. For in-memory
objects, pass them to ibis.memtable or create_table.

Description of changes

The register method is removed everywhere. Test files have been renamed to
test_io.py instead of test_register.py, or they have been removed entirely
because they are duplicates of tests in test_client.py or elsewhere.

Issues closed

#10175

[gforsyth]

Hmm, so the datafusion backend has an option which is unique to that backend, where we allow a user to pass in a dictionary of {table_name: file_to_load} -- at connection creation, we hand each of these files off to register to load all of the files as tables.

I recognize the convenience here, but it's also against our general push towards requiring explicit table creation.

Do we rip that out, too? Or leave in _register as a private method in the datafusion backend to handle this?

[IndexSeek]

Thank you for prepping this!

Do we rip that out, too? Or leave in _register as a private method in the datafusion backend to handle this?

That's tricky. I can't imagine it's used too widely, but I vote to leave it there if anyone uses that functionality with the DataFusion backend today.

Could we mark it deprecated and for the instead guide the user in creating these tables explicitly?

[gforsyth]

That's tricky. I can't imagine it's used too widely, but I vote to leave it there if anyone uses that functionality with the DataFusion backend today.

Could we mark it deprecated and for the instead guide the user in creating these tables explicitly?

Thanks, @IndexSeek ! This seemed like a good suggestion, so I've remove the public register method, but left the private one in along with deprecating its usage in loading files at connection time.

[cpcloud]

🚢 it