Thanks Kaniz.

I must use a shared cluster because I'm reading from a DLT table stored in a Unity Catalog.

https://docs.databricks.com/en/data-governance/unity-catalog/compute.html

My understanding is that shared clusters are enforcing the Py4J policy I referenced.  I am not sure if this is the same as what you refer to as "table access control", but also I am not trying to use readStream().  Rather I'm trying to use code from a third-party library that isn't included in the base cluster runtime. I've installed this library by supplying Maven coordinates in the compute configuration.

So I am wondering if it's possible to, as a customer that must use a shared cluster under the circumstances I described, allowlist third party code that I choose.  Otherwise, how is one to use third-party code that hasn't yet been allowlisted while reading from DLT in Unity?