thisisnic commented on PR #35543:
URL: https://github.com/apache/arrow/pull/35543#issuecomment-1546307021
While I agree that it's not the best that `schema()` would do both
construction and extraction here, the aim here was to come up with something
intuitive for users that avoids having to use the `$` for extraction, and I
don't think that any of the alternatives quite fit that; I agree that the
`as_*` functions sound more conversion than extraction. I just spent ~30
minutes browsing through docs for other packages (mainly
tidyverse/tidymodels/r-lib etc) to see how they handle this kind of thing, but
there aren't any good analogous examples.
I also considered whether there are other attributes we might want to
implement extraction functions like this for, but I think schemas are the only
case and so here's no general problem to solve. Given that multiple people
(Neal, myself, and also Francois on the original ticket) report having tried to
use `schema()` to extract a schema despite knowing that `schema()` is (also)
the function for creating schemas, it might be the best intuitive option we
have right now?
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