triopo opened a new pull request, #20032:
URL: https://github.com/apache/druid/pull/20032
### Description
SinglePhaseParallelIndexTaskRunner built the parent's SegmentIdWithShardSpec
using the interval as returned from the sub-task, which retains its original
time zone. When segmentGranularity specifies a non-UTC time zone (e.g.
Europe/Warsaw), Interval#toString() renders with the zone offset (e.g.
"2026-04-08T00:00:00.000+02:00"), while the sub-task's own segment ID for the
same interval is built from a JSON-deserialized interval that normalizes to UTC
("2026-04-07T22:00:00.000Z"). The two string representations differ, so
matching prevSegmentId via indexOf() fails and parallel indexing breaks for
non-UTC segment granularities.
Normalize the interval to UTC before constructing the parent's segment ID so
it matches what sub-tasks produce.
This PR has:
- [ x] been self-reviewed.
- [ ] added documentation for new or modified features or behaviors.
- [ ] a release note entry in the PR description.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
- [ x] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [ ] added integration tests.
- [x ] been tested in a test Druid cluster.
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