rohangarg opened a new pull request, #12715:
URL: https://github.com/apache/druid/pull/12715
This change allows for providing custom calcite rules from extensions to
participate in query planning. The custom rules from extensions could be used
to either do logical transformations for a query plan (some org specific
optimization or experiment through a custom extension) or physical
transformations (custom native query planning).
For adding a custom rule, the extension will require an implementation of
`DruidExtensionCalciteRuleProvider` which will provide the custom rule. Along
with that, it would be required to bind that rule provider via a guice
multibinder to `ExtensionCalciteRuleProvider` annotation.
An example binding would look like :
`Multibinder.newSetBinder(binder, DruidExtensionCalciteRuleProvider.class,
ExtensionCalciteRuleProvider.class).addBinding().toInstance(<provider-instance>)`
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/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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