[jira] [Closed] (FLINK-11785) Replace case class Null(type) in Table API

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

     [ https://issues.apache.org/jira/browse/FLINK-11785?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Timo Walther closed FLINK-11785.
--------------------------------
       Resolution: Fixed
    Fix Version/s: 1.8.0
     Release Note: Null literals in the Table API need to be defined with `nullOf(type)` instead of `Null(type)` from now on. The old approach is deprecated.

Fixed in 1.8.0: 76838678b8f4f81b187a4449bfde05d45c4fdddb
Fixed in 1.9.0: dd68edd8e6519013d2ab3bd2d4d815f1997ac0fe

> Replace case class Null(type) in Table API
> ------------------------------------------
>
>                 Key: FLINK-11785
>                 URL: https://issues.apache.org/jira/browse/FLINK-11785
>             Project: Flink
>          Issue Type: Improvement
>          Components: API / Table SQL
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.8.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> FLINK-11449 has shown parts of the API that have not been designed properly. Especially, direct usages of case classes that will be only in the planner module should not be exposed through the API.
> Using {{null}} for representing a null literal is currently not supported in the Table API as a general {{NULL}} type and/or proper type inference is missing. Therefore, nulls must be typed using {{Null(Type.STRING)}}. However, this encourages users to use case classes instead of the Scala DSL.
> We could implement a implicit object for {{Null}}, however, all functions and literals currently start with a lower case except for this object. I would recommend to introduce {{nullOf(type)}} instead. This would allow us to have {{nullOf(type)}} and {{null}} in the future.



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