[GitHub] [flink] twalthr opened a new pull request #8822: [FLINK-12899][table] Introduce a resolved expression with data type

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

twalthr opened a new pull request #8822: [FLINK-12899][table] Introduce a resolved expression with data type
URL: https://github.com/apache/flink/pull/8822
 
 
   ## What is the purpose of the change
   
   This separates calls to functions into resolved and unresolved call
   expressions. Unresolved expressions are created in the API and are
   translated to resolved expression. Resolved expressions are validated
   and contain a return type. Table operations and planner should work
   with resolved expressions only.
   
   ## Brief change log
   
   - Introduction of {{ResolvedExpression}}
   - Introduction of {{CallExpression}} with implements the above interface
   - Ensure that only {{ResolvedExpression}}s leave the API
   
   ## Verifying this change
   
   This change is already covered by existing tests.
   
   ## 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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