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      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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              • Assignee:
                twalthr Timo Walther
                Reporter:
                twalthr Timo Walther
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