Timo Walther created FLINK-11785:
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Summary: 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
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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