iyupeng opened a new pull request #17344:
URL: https://github.com/apache/flink/pull/17344
## What is the purpose of the change
This pull request follows #14894 which has been inactive for months.
This pull request addresses review comments in the existing pull request and
is based on the existing one.
All the code changes are targeted to make it possible to push down local
aggregations from computing layer to storage layer for better computing & I/O
performance.
This feature is disabled by default.
## Brief change log
- *Add a new configuration of
`table.optimizer.source.aggregate-pushdown-enabled` to control the aggregation
push down, and the default value is `false` which is up to the users to decide
enable it or not.*
- *Add an abstract class of `PushLocalAggIntoScanRuleBase` for supporting
both with and without sort operator.*
- *Add a new rule of `PushLocalSortAggWithoutSortIntoScanRule` for sort
aggregation without sort case.*
- *Add a new rule of `PushLocalSortAggWithSortIntoScanRule` for sort
aggregation with sort case.*
- *Add a new rule of `PushLocalHashAggIntoScanRule` for hash aggregation
case.*
- *Add new push down spec `AggregatePushDownSpec` to serialize/deserialize
aggregations.*
- *Implement the `SupportsAggregatePushDown` interface for
`TestValuesScanTableSource`.*
- *Some other unit tests and integration tests.*
## Verifying this change
This change added tests and can be verified as follows:
- *Added unit test class `PushLocalAggIntoTableSourceScanRuleTest` for
plan verifications*
- *Added integration test class `LocalAggregatePushDownITCase` for
end-to-end functional test*
## 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, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (yes)
- If yes, how is the feature documented? (JavaDocs)
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