[jira] [Commented] (KAFKA-6684) Support casting values with bytes schema to string

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-6684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16424234#comment-16424234 ] 

ASF GitHub Bot commented on KAFKA-6684:
---------------------------------------

amitsela opened a new pull request #4820: KAFKA-6684 [WIP]: Cast transform bytes
URL: https://github.com/apache/kafka/pull/4820
 
 
   Allow to cast LogicalType to string by calling the serialized (Java) object's toString().   
   
   Added tests for `BigDecimal` and `Date` as whole record and as fields. 
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   

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> Support casting values with bytes schema to string 
> ---------------------------------------------------
>
>                 Key: KAFKA-6684
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6684
>             Project: Kafka
>          Issue Type: Improvement
>          Components: KafkaConnect
>            Reporter: Amit Sela
>            Priority: Major
>
> Casting from BYTES is not supported, which means that casting LogicalTypes is not supported.
> This proposes to allow casting anything to a string, kind of like Java's {{toString()}}, such that if the object is actually a LogicalType it can be "serialized" as string instead of bytes+schema.
>  
> {noformat}
> Examples:
> BigDecimal will cast to the string representation of the number.
> Timestamp will cast to the string representation of the timestamp, or maybe UTC yyyymmddTHH:MM:SS.f format?
> {noformat}
>  
> Worst case, bytes are "casted" to whatever the {{toString()}} returns - its up to the user to know the data.
> This would help when using a JSON sink, or anything that's not Avro.



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