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https://issues.apache.org/jira/browse/KAFKA-6684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16458262#comment-16458262
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Ewen Cheslack-Postava commented on KAFKA-6684:
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The idea here seems quite similar to the SimpleHeaderConverter included with
KIP-145. We might want to consider a) standardizing all these
casts/transformations across the different mechanisms (Cast transformation and
SimpleHeaderConverter) and b) reusing as much code as possible. For (b), we
might be able to just check whether something is a logical type and then always
delegate to shared code from SimpleHeaderConverter so we get a minimal
implementation w/ all the support for different types.
> 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: Critical
> Fix For: 2.0.0
>
>
> 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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