*: Remove unnecessary arrow structs

[brancz]

Anything that needs to be built adds latency to the query path, and this removes a number of dynamic dispatch calls and prevents 2 validity bitmaps from being built.

[alwaysmeticulous]

✅ Meticulous spotted zero visual differences across 344 screens tested: view results.

_{Last updated for commit 7f62190. This comment will update as new commits are pushed.}