[GitHub] [flink] hequn8128 opened a new pull request #8979: [FLINK-13087][table] Add group window Aggregate operator to Table API

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hequn8128 opened a new pull request #8979: [FLINK-13087][table] Add group window Aggregate operator to Table API
URL: https://github.com/apache/flink/pull/8979
 
 
   
   ## What is the purpose of the change
   
   This pull request adds row-based group window Aggregate operator to Table API. 
   Also, there are some hotfixes in separate commits. The implementation window aggregate operator depends on some hotfixes, so I didn't create other jiras.
   
   
   ## Brief change log
   
   There are totally 5 commits:
     - [#f5e8d1f](https://github.com/apache/flink/commit/f5e8d1f60a1de4ff69e5e713c4382327c149f33c) Resolve indent problem for `WindowFlatAggregateTableImpl`.
     - [#9395878](https://github.com/apache/flink/commit/939587853716a64c787af17be4610216f9c3b225) Add call support in the group by for row based aggregate. For example, support groupBy('a % b) expressions.
     - [#ee2b065](https://github.com/apache/flink/commit/ee2b06567ef11569dc29fd3c9622fd8afbc49bcc) Throw exceptions if there is a start in the select after window (table)aggregate. Because we don't know which window properties should be selected.
     - [#365f31d](https://github.com/apache/flink/commit/365f31da14376b74dd4a3286dbe0ae17be22d4a6) Validate alias length for aggregate. The alias length should equal to the length of result type.
     - [#deca009](https://github.com/apache/flink/commit/deca0096d4ed9b59718e0a14c8f242bdaaab55d5) Add group window Aggregate operator to Table API
   
   For the last commit: Add group window Aggregate operator to Table API, it mainly contains the following changes
     - Add `aggregate` method to the `WindowGroupedTable`
     - Build `windowAggregate` QueryOperation in `OperationTreeBuilder`
     - Add tests and docs
   
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
   
     - Added plan tests in `AggregateStringExpressionTest`, `AggregateTest`
     - Add validation tests in `GroupWindowValidationTest`
     - Add IT tests in `GroupWindowITCase`
   
   ## 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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