Function derive_slicing_dims 

pub fn derive_slicing_dims(
    filter_a: &RowFilter,
    filter_b: &RowFilter,
) -> Vec<Dimension>

Re-exports of the dimensional-slicing types used by cargo-ktstr’s BuildCompareFilters::build() plumbing. The stats module is pub(crate) (its tabular reporting types have no stable surface yet), but the cargo-ktstr binary needs Dimension and derive_slicing_dims to unit-test the filter-builder shape (the BuildCompareFilters tests assert which slicing dim a per-side filter pair derives). Same pattern as CpuCap above: keep the canonical definitions in stats (where the comparison plumbing consumes them internally) and re-export the slim slicing surface through cli so the binaries reach them through the public cli module. Derive the set of dimensions on which filter_a and filter_b differ. These are the SLICING dimensions — dimensions on which the two sides select disjoint cohorts and therefore form the A/B contrast. The complement (every other dimension) is the PAIRING-key dimension set used by compare_rows to join A-side rows against B-side rows.

Comparison shape per dimension: every dim uses the same SORTED-DEDUPED Vec<&str> comparison — order and multiplicity don’t matter (--a-kernel 6.14 --a-kernel 6.15 and --b-kernel 6.15 --b-kernel 6.14 are NOT a slice). All nine dimensions are repeatable Vec filters; the previously Option<String>-typed scheduler / topology / work_type dims were promoted to Vec<String> so the operator-visible shape is uniform across every dimension.

Returns dimensions in canonical (Dimension::ALL) order so callers (header lines, error messages, side labels) get a stable presentation. Only a Dimension::SLICEABLE dimension can be a slicing dim; the non-sliceable dims are filter + pairing only and are only ever set via a single shared --<x> filter (applied to BOTH sides), so they can never differ A↔B — the walk skips them.