[feat] Suggest column names from all tables in the current database after SELECT (#212)

[scottnemes]

Description

After typing SELECT, columns from all tables in the current database will be returned as auto complete suggestions. This allows the user to get completions for columns without having to write the FROM clause first.

Resolves #212

Checklist

• I've added this contribution to the changelog.md.
• I've added my name to the AUTHORS file (or it's already there).
• I ran uv run ruff check && uv run ruff format && uv run mypy --install-types . to lint and format the code.

[rolandwalker]

Outstanding!

[rolandwalker]

Will keywords still complete here?

Edit: yes, but this needs some further work for SELECT COUNT(…)'. COUNT` is buried.

[scottnemes]

Will keywords still complete here?

Edit: yes, but this needs some further work for SELECT COUNT(…)'. COUNT` is buried.

@rolandwalker Not sure what you mean here, it works as I would expect. Columns show up first with no further input, so COUNT and other functions are farther down if that's what you mean. But that implies having an arbitrary weight (which we could do) to a function like COUNT. But once you start typing, it works as I would expect.

And comparing to current functionality, which works the same:

[rolandwalker]

Right. Working on finesse for builtins such as COUNT() in #1500.