[GitHub] XuQianJin-Stars opened a new pull request #7228: [FLINK-9740][Table API &SQL] Support group windows over intervals of months

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XuQianJin-Stars opened a new pull request #7228: [FLINK-9740][Table API &SQL] Support group windows over intervals of months
URL: https://github.com/apache/flink/pull/7228
 
 
   ## What is the purpose of the change
   
   *(*This PR is designed to solve the problem of Support group windows over intervals of months.)*
   
   ## Brief change log
   
   *(for example:)*
   
   - *Increase in `DataStreamLogicalWindowAggregateRule.scala` processing logic of the month*
   - *Increase in `DataStreamGroupWindowAggregate.scala` processing logic of the month*
   - *Add `isMonthsIntervalLiteral` and `toMonths` functions to `expressionutils.scala`*
   - *Add the `month` function in `time.java`*
   
   ## Verifying this change
   
   *(Please pick either of the following options)*
   
   This change is a trivial rework / code cleanup without any test coverage.
   
   *(or)*
   
   This change is already covered by existing tests, such as *(please describe tests)*.
   
   *(or)*
   
   This change added tests and can be verified as follows:
   
   *(example:)*
   
   - *I added `TestWindowForMonthsInterval` to `SqlITCase`.*
   
   ## 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, Yarn/Mesos, 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)

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