Struct NormalizeFold 

pub struct NormalizeFold { /* private fields */ }

The server-side serializer (§4): one per registered normalized query. Fold each committed transaction’s CaughtChanges with fold to get that tick’s NormalizedOps. The footprint persists across ticks; the snapshot is simply the first fold over the hydrate batch (every row 0→1 ⇒ all Adds).

Implementations

impl NormalizeFold

pub fn new(ast: &Ast, pk: PkMap) -> NormalizeFold

Build a fold for the query ast, with pk giving each table’s primary-key column indices (the server derives this from its source schemas; tests pass it inline). Panics if pk omits a table the query’s tree can surface — a build-time config invariant, not a data-reachable error.

pub fn tree(&self) -> &TableNode

The query’s table tree (slot → child table), derived from the AST.

pub fn footprint_snapshot(&self) -> Vec<NormalizedOp>

The current footprint as a seq-0 snapshot: one NormalizedOp::Add per live row, in deterministic (sorted by table, then PK) order. This baselines a late subscriber attaching to an already-hydrated shared query from the cached footprint, without re-running the engine pipeline (RINDLE-SERVER-DESIGN.md §11) — the membership is binary on the wire, so the intra-query refcount is not surfaced.

pub fn fold(&mut self, changes: &[CaughtChange]) -> Vec<NormalizedOp>

Fold one committed transaction (or the hydrate snapshot) into its net NormalizedOps, updating the persistent footprint. An empty / no-membership- change tick returns [].

pub fn fold_footprint_only(&mut self, changes: &[CaughtChange])

Update the footprint for one transaction without producing wire ops — the allocation-light path for a query nobody is currently receiving (a pinned, zero- subscriber materialization) and for the hydrate fold (whose ops the drain discards, baselining late subscribers off footprint_snapshot instead). It skips the per-tick diff map (the Tick), the tick-start row capture, and the emit pass entirely — exactly the allocations the wiki-demo RSS profiling traced the glibc retention to. The footprint it leaves is byte-identical to what fold would leave, so a later subscriber’s snapshot is unaffected.

Trait Implementations

impl Debug for NormalizeFold

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.