beyond1920 opened a new pull request #2664:
URL: https://github.com/apache/calcite/pull/2664
## What is the purpose of the change
The pr aims to support SQL hints for temporal table join.
## Brief change log
- Extends `Correlate` to be a `Hintable`
- Add a hint predicate in `HintPredicates`
## Verifying this change
- Add tests in `SqlHintsConverterTest` to validate the hint could be
propagated to `Correlate`
- Add tests in `RelBuilderTest`
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