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Subject [GitHub] hequn8128 opened a new pull request #7209: [FLINK-10977][table] Add UnBounded FlatAggregate operator to streaming Table API
Date Sat, 01 Dec 2018 07:32:30 GMT
hequn8128 opened a new pull request #7209: [FLINK-10977][table] Add UnBounded FlatAggregate
operator to streaming Table API
URL: https://github.com/apache/flink/pull/7209
   ## What is the purpose of the change
   This pull request adds UnBounded FlatAggregate operator to streaming Table API.
   The design doc can be found [here](https://docs.google.com/document/d/1tnpxg31EQz2-MEzSotwFzqatsB4rNLz0I-l_vPa5H4Q/edit#heading=h.q23rny2iglsr).
   Some discussion about flatAggregate can be found [here](http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/DISCUSS-Table-API-Enhancement-Outline-td25070.html).
   ## Brief change log
     - Add flatAggregate api to Table. In order to close the "flatAggregate" with a select
statement, add a FlatAggTable and a GroupedFlatAggTable class.
     - Add TableAggregateFunction for User-Defined Table Aggregates. User can register a TableAggregateFunction
through table environment.
     - Add logical relnodes for TableAggregate: `LogicalTableAggregate`, `FlinkLogicalTableAggregate`,
     - Add Rules for TableAggregate relnodes.
     - Refactor codegen logic for Aggregations. Add a `TableAggregationCodeGenerator` code
generator to generate the TableAggregate runtime function.
     - Add documents and tests.
     - Add a enforceKeyFields() method in `UpsertStreamTableSink` in order to upsert output
results of flatAggregate, i.e, `UpsertStreamTableSink` requires keys when upsert data. The
enforceKeyFields() return empty array by default. Users can override the method if the data
contain logical key fields. However, I find that java subclasses still have to implement the
scala default method. In order to solve the scala problem, I migrated the scala sink interfaces(`AppendStreamTableSink`,
`RetractStreamTableSink`, `UpsertStreamTableSink` etc) to java, thus the java subclasses do
not have to inherit the default methods.
   ## Verifying this change
   This change added tests and can be verified as follows:
     - Added integration tests, plan tests, validation tests for TableAggregate. 
   ## 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)`: (yes)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing,
Yarn/Mesos, 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? (docs)

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