reaggregate support for groupBy.#178

Draft

cpwright wants to merge 25 commits intomainfrom

nightly/cpw/rollupgroups

Commits on Dec 11, 2025

formula stuff
cpwright
committed

Commits on Dec 12, 2025

reagg formula examples
cpwright
committed

Commits on Dec 29, 2025

Commits on Dec 30, 2025

more todos for reuse.
cpwright
committed

Commits on Jan 13, 2026

Commits on Jan 14, 2026

operator should always be updated for a formula, produce mangled results.
cpwright
committed