[jira] [Created] (FLINK-15487) Expose the new type inference for scalar functions

["Timo Walther (Jira)" <ji...@apache.org>]

Timo Walther created FLINK-15487:
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             Summary: Expose the new type inference for scalar functions
                 Key: FLINK-15487
                 URL: https://issues.apache.org/jira/browse/FLINK-15487
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API, Table SQL / Planner
            Reporter: Timo Walther
            Assignee: Timo Walther


After FLINK-15281 is merged, we are able to introduce functions with the new type inference. We start by enabling scalar functions through the stack.

This includes the following changes:

- Introduce a {{UserDefinedFunction.getTypeInference}} method
- Expose {{TableEnvironment.createTemporarySystemFunction}} and {{TableEnvironment.createTemporaryFunction}}
- Update FunctionCatalog
- Update the code generation



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