[jira] [Created] (FLINK-12924) Introduce basic type inference interfaces

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-12924:
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             Summary: Introduce basic type inference interfaces
                 Key: FLINK-12924
                 URL: https://issues.apache.org/jira/browse/FLINK-12924
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API
            Reporter: Timo Walther
            Assignee: Timo Walther


This issue introduces basic interfaces for performing type inference. It includes validation of input types and deduction of accumulator or return types. Argument type inference (i.e. deducing a type for \{{NULL}}) will be introduced in a later step. The interfaces replace the need for \{{PlannerExpression}}.

A rough design document can be found here but it needs some update. Introduction of annotations and basic type extraction will come later: [https://docs.google.com/document/d/1RM_-XvD25AldUOl7xRSvA3sascWBa1-Jze3i5mvb7WU/edit#heading=h.kwyjplavecx4
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