[GitHub] [flink] twalthr opened a new pull request #8933: [FLINK-12968][table-common] Add an utility for finding a common type from a set of types

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

twalthr opened a new pull request #8933: [FLINK-12968][table-common] Add an utility for finding a common type from a set of types
URL: https://github.com/apache/flink/pull/8933
 
 
   ## What is the purpose of the change
   
   This adds the last utility required to perform type inference properly. It is meant for finding a common, more general `LogicalType` for a given set of types. If such a type exists, all given types can be casted to this more general type. It aims to be compatible with the SQL standard. It is inspired by Apache Calcite's `SqlTypeFactoryImpl#leastRestrictive` method.
   
   ## Brief change log
   
   Utility class added.
   
   ## Verifying this change
   
   This change added tests and can be verified as follows: `LogicalTypeGeneralizationTest`
   
   ## 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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