[GitHub] [flink] twalthr opened a new pull request #8360: [FLINK-12393][table-common] Add the user-facing classes of the new type system

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

twalthr opened a new pull request #8360: [FLINK-12393][table-common] Add the user-facing classes of the new type system
URL: https://github.com/apache/flink/pull/8360
 
 
   ## What is the purpose of the change
   
   This PR introduces the `DataType` class and subclasses. Users are able to do a star import of `DataTypes` and declare types like: `MULTISET(MULTISET(INT())`. Very close to SQL. As mentioned in FLIP-37, data types allow to specify format hints to the planner using `TIMESTAMP(9).bridgedTo(java.sql.Timestamp.class)`.
   
   ## Brief change log
   
   - `DataType` structure
   - `DataTypes` enumeration of types
   
   
   ## Verifying this change
   
   See `org.apache.flink.table.types.DataTypesTest`.
   
   ## 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? JavaDocs
   

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