pub const PUSH_CHUNK_ROWS: usize = 1024;Expand description
Upper bound on one streamed fan-out chunk, in captured rows
(CLUSTER-INCREMENTAL-FANOUT-DESIGN.md §4.2). Bounds the writer’s transient capture
buffer — and, on the live replica, the per-worker transient output and the
cross-thread message — to O(chunk) rather than O(txn); a txn ≤ this size streams
as a single chunk. Owned by the apply plane because the between-statement drain
(ApplyTxn::maybe_pump) is what enforces the writer-side bound, with or without a
derivation pool on the other end.