jihoonson opened a new pull request #10592:
URL: https://github.com/apache/druid/pull/10592
### Description
This PR allows Parallel task to run without explicit intervals in
granularitySpec. If intervals are missing, the parallel task executes an extra
step for input sampling which collects the intervals to index.
This PR additionally fixes a bug when `numShards` is missing in hash
partitioning. When `numShards` is missing, the parallel task computes it by
scanning the whole input. However, the computed numShards was ignored when it's
serialized into JSON. To fix it, this PR adds another field
`intervalToNumShardsOverride` which stores the computed numShards per interval
so that we can handle data skew well across intervals.
<hr>
This PR has:
- [x] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [x] added documentation for new or modified features or behaviors.
- [x] 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/licenses.yaml)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [x] 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.
- [ ] been tested in a test Druid cluster.
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