godfreyhe opened a new pull request, #20243: URL: https://github.com/apache/flink/pull/20243
## What is the purpose of the change *Introduce APPROX_COUNT_DISTINCT aggregate function for batch sql, see https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=217386481 for more details* ## Brief change log - *Introduce APPROX_COUNT_DISTINCT aggregate function in FlinkSqlOperatorTable* - *Introduce HyperLogLogPlusPlus * - *Implement ApproxCountDistinctAggFunction for different types* ## Verifying this change This change added tests and can be verified as follows: - *Added HyperLogLogPlusPlusTest to verify the logic of HyperLogLogPlusPlus* - *Added ApproxCountDistinctAggFunctionTest to verify the logic of ApproxCountDistinctAggFunctions* - *Extended SortAggregateTest to verify the plan for APPROX_COUNT_DISTINCT queries* - *Extended SortAggITCase to verify the result for APPROX_COUNT_DISTINCT queries* ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (yes / **no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (**yes** / no) - The serializers: (yes / **no** / don't know) - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't know) - The S3 file system connector: (yes / **no** / don't know) ## Documentation - Does this pull request introduce a new feature? (**yes** / no) - If yes, how is the feature documented? (not applicable / docs / JavaDocs / **not documented**) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
