Beta.7 was pulled because it introduced some regressions around certain rarer functions (e.g. computed column functions which return arrays of scalars, custom query functions which return sets of complex scalars such as interval).
This beta.8 fixes all the above, adds a load more tests to avoid regressions, and also fixes additional edge-cases relating to functions - particularly in the handling of mutation functions that return null table types.
Please refer to the beta.7 release notes for the other advances!
I'd welcome PRs which expand the tests to cover more situations to avoid regressions in future!