This patch release fixes two correctness issues in stateful pipeline execution. Partition rebuilds now complete after writing replacement partitions, and periodic summarize output remains deterministic for delayed or sparse streams.
🐞 Bug Fixes
Section titled “🐞 Bug Fixes”Partition rebuild completion
Section titled “Partition rebuild completion”Apr 20, 2026 · @tobim, @codex · #6059
Partition rebuilds now finish after persisting rebuilt partitions. Previously, rebuild jobs could remain stuck indefinitely even though the replacement partitions were written successfully.
Deterministic periodic summarize output
Section titled “Deterministic periodic summarize output”The summarize operator now starts frequency-based emission with the first
input event and emits overdue periodic results before later events are
aggregated. This makes periodic output deterministic in reset,
cumulative, and update modes for delayed or sparse streams.
For example:
from {ts: 0ms.from_epoch(), x: 1}, {ts: 90ms.from_epoch(), x: 1}, {ts: 360ms.from_epoch(), x: 1}delay tssummarize count=count(), options={frequency: 300ms, mode: "cumulative"}The first periodic result now consistently reports a count of 2 before the
third event arrives.