[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_r260187263
 
 

 ##########
 File path: docs/structured-streaming-kafka-integration.md
 ##########
 @@ -499,20 +522,28 @@ StreamingQuery ds = df
   .option("topic", "topic1")
   .start();
 
-// 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
 StreamingQuery ds = df
   .selectExpr("topic", "CAST(key AS STRING)", "CAST(value AS STRING)")
   .writeStream()
   .format("kafka")
   .option("kafka.bootstrap.servers", "host1:port1,host2:port2")
   .start();
 
+// Write key-value data from a DataFrame to Kafka using the topic specified in the path option
+StreamingQuery ds = df
+  .selectExpr("CAST(key AS STRING)", "CAST(value AS STRING)")
 
 Review comment:
   would it be better to change it in all places in this doc file if we anyway touch it?

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