[GitHub] [flink] twalthr opened a new pull request #8335: [FLINK-12253][table-common] Setup a class hierarchy for the new logical type system

[GitBox <gi...@apache.org>]

twalthr opened a new pull request #8335: [FLINK-12253][table-common] Setup a class hierarchy for the new logical type system
URL: https://github.com/apache/flink/pull/8335
 
 
   ## What is the purpose of the change
   
   This PR implements all logical types that Flink's type system should support in the near future. As the name indicates, these type classes are purely logical to allow declarations and intentions across modules and in the API. Planners/runtime can still decide which type and precision is supported physically.
   
   An exact listing can be found in FLIP-37: https://docs.google.com/document/d/1a9HUb6OaBIoj9IRfbILcMFPrOL7ALeZ3rVI66dvA2_U/edit#
   
   The most important content of this PR are the JavaDoc comments that clearly define each type and should avoid ambiguity. Catalogs/connectors/planners should adapt to those definitions.
   
   ## Brief change log
   
   - 27 logical types added
   
   ## Verifying this change
   
   - `org.apache.flink.table.types.LogicalTypesTest`
   
   ## 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, 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? JavaDocs
   

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