mshahid6 opened a new pull request, #19643:
URL: https://github.com/apache/druid/pull/19643
Fixes #19314
### Description
Builds on #19107 (the OpenLineage request-logger extension) to add
**column-level lineage** for native queries. Each input dataset now carries
which columns the query referenced and how they were used.
Two facets are attached per input dataset:
- **`schema`** — the standard OpenLineage `SchemaDatasetFacet` listing the
referenced input column names (names only, sorted).
- **`druid_columnUsage`** — a Druid-specific dataset facet mapping each
referenced column to the role(s) it was used in: `PROJECTION`, `GROUP_BY`,
`AGGREGATION`, `FILTER`, `JOIN`.
### Release note
The OpenLineage emitter now emits column-level lineage for native queries as
`schema` and `druid_columnUsage` facets on input datasets. This can be disabled
with `druid.request.logging.columnLineageEnabled=false`.
<hr>
##### Key changed/added classes in this PR
* `OpenLineageRequestLogger`
* `OpenLineageRequestLoggerProvider`
* `DruidColumnUsageDatasetFacet.json`
<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] a release note entry in the PR description.
- [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/dev/license.md)
- [ ] 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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