Since my question remained unanswered on the user list, I dare to ask again on the dev list:
While experimenting with polars [1] (which is based on arrow-rs) I found that it's not possible to read a single file from our on-prem S3-compatible storage. Any attempts result in SSL error messages: error trying to connect: invalid peer certificate: UnknownIssuer Such SSL errors are well-known to us and usually get fixed by setting the environment variable SSL_CERT_FILE (or something similar) pointing to our company's certstore. polars seems to ignore that env var. Now it's unclear to me whether this is an issue of polars or arrow-rs (or anything else). For more details see [2]. [1] https://pola.rs/ [2] https://github.com/pola-rs/polars/issues/13741
