beyond1920 opened a new pull request #2661:
URL: https://github.com/apache/calcite/pull/2661
## What is the purpose of the change
The pr aims to introduce a new RelDistribution.Type (HASH_RANDOM) to solve
data skew caused by Hash type.
## Brief change log
- Add a value `HASH_RANDOM_DISTRIBUTED` in enum `RelDistribution#Type`
- Add a method `getHashRandomNumber` in interface `RelDistribution`, which
default return null.
- Update `RelDistributions` to apply for the new enum value in
`RelDistribution#Type`
- Update `ExchangeRemoveConstantKeysRule` to take new enum value in
`RelDistribution#Type` into consideration
- Update `RelJson` to take the hashRandomNumber into consideration when
convert to/From Json
## Verifying this change
- Add tests in `RelWriterTest`, `RelDistributionTest`, `RelBuilderTest`,
`RelOptRulesTest`
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