Module consolidate 

A ContainerBuilder that consolidates (D, T, R) updates and emits columnar containers.

Two-level buffering:

1. AoS staging Vec<(D, T, R)> with a small cap so consolidate_updates’ n log n cost stays bounded. Cancellations and same-key updates collapse here before reaching the column-shaped storage. A drain-multiple-of-half-cap trick keeps the leftover in staging, so cross-batch keys with the same (D, T) continue consolidating on the next sort.
2. SoA accumulator: one sub-container per column. Drains push in fixed-size chunks (DRAIN_CHUNK_ROWS) with three sequential per-column passes per chunk, checking the serialized size per chunk; at the flush threshold the accumulator is serialized into an aligned Vec<u64> and shipped as Column::Align, and the trailing partial on finish ships as Column::Typed.

Generic over (D, T, R): Columnar via the columnar tuple decomposition <(D, T, R) as Columnar>::Container = (D::Container, T::Container, R::Container).

Structs

ConsolidatingColumnBuilder

A container builder that consolidates (D, T, R) updates and emits Column<(D, T, R)>. See the module docs for the two-level buffering pipeline.