TsReaper opened a new pull request #13764:
URL: https://github.com/apache/flink/pull/13764
## What is the purpose of the change
Due to CALCITE-4351 `FlinkRelMdDistinctRowCount#getDistinctRowCount(Calc)`
will always return 0 when number of rows are large.
This PR introduces our own `FlinkRelMdUtil#numDistinctVals` to treat small
and large inputs in different ways. For small inputs we use the more precise
`RelMdUtil#numDistinctVals` and for large inputs we copy the old, approximated
implementation of `RelMdUtil#numDistinctVals`.
This is a temporary solution. When CALCITE-4351 is fixed we should revert
this commit.
## Brief change log
- Introduce `FlinkRelMdUtil#numDistinctVals`
## Verifying this change
This change is already covered by existing tests, also this change added
tests and can be verified by running the added tests.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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