[GitHub] Nimfadora commented on a change in pull request #23791: [SPARK-20597][SQL][SS][WIP] KafkaSourceProvider falls back on path as synonym for topic

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Nimfadora commented on a change in pull request #23791: [SPARK-20597][SQL][SS][WIP] KafkaSourceProvider falls back on path as synonym for topic
URL: https://github.com/apache/spark/pull/23791#discussion_r261521069
 
 

 ##########
 File path: docs/structured-streaming-kafka-integration.md
 ##########
 @@ -539,35 +578,43 @@ ds = df \
 <div data-lang="scala" markdown="1">
 {% highlight scala %}
 
-// Write key-value data from a DataFrame to a specific Kafka topic specified in an option
+// Write key-value data from a DataFrame to Kafka using the topic specified in the topic option
 df.selectExpr("CAST(key AS STRING)", "CAST(value AS STRING)")
   .write
   .format("kafka")
   .option("kafka.bootstrap.servers", "host1:port1,host2:port2")
   .option("topic", "topic1")
   .save()
 
-// Write key-value data from a DataFrame to Kafka using a topic specified in the data
+// Write key-value data from a DataFrame to Kafka using the topic specified in the data
 df.selectExpr("topic", "CAST(key AS STRING)", "CAST(value AS STRING)")
   .write
   .format("kafka")
   .option("kafka.bootstrap.servers", "host1:port1,host2:port2")
   .save()
 
+// Write key-value data from a DataFrame to Kafka using the topic specified in the path option
+df.selectExpr("CAST(key AS STRING)", "CAST(value AS STRING)")
+  .write
+  .format("kafka")
+  .option("kafka.bootstrap.servers", "host1:port1,host2:port2")
+  .option("topic", "topic1")
+  .save()
 
 Review comment:
   @gaborgsomogyi I don't quite understand where a java version  should be specified, could you explain, please?

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