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https://issues.apache.org/jira/browse/SPARK-17935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15626800#comment-15626800
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Michael Armbrust commented on SPARK-17935:
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You should be able to use casts (which I'd expect the sink to handle
automatically for common types like strings) and Spark's built in function
library (e.g. [to_json|https://github.com/apache/spark/pull/15354]).
> Add KafkaForeachWriter in external kafka-0.8.0 for structured streaming module
> ------------------------------------------------------------------------------
>
> Key: SPARK-17935
> URL: https://issues.apache.org/jira/browse/SPARK-17935
> Project: Spark
> Issue Type: Improvement
> Components: SQL, Streaming
> Affects Versions: 2.0.0
> Reporter: zhangxinyu
>
> Now spark already supports kafkaInputStream. It would be useful that we add
> `KafkaForeachWriter` to output results to kafka in structured streaming
> module.
> `KafkaForeachWriter.scala` is put in external kafka-0.8.0.
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