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https://issues.apache.org/jira/browse/FLINK-12924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timo Walther updated FLINK-12924:
---------------------------------
    Description: 
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]
 

  was:
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
]


> 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
>            Priority: Major
>
> 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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