HeartSaVioR commented on a change in pull request #35343:
URL: https://github.com/apache/spark/pull/35343#discussion_r799127211



##########
File path: 
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaMicroBatchStream.scala
##########
@@ -73,6 +73,10 @@ private[kafka010] class KafkaMicroBatchStream(
     Utils.timeStringAsMs(Option(options.get(
       
KafkaSourceProvider.MAX_TRIGGER_DELAY)).getOrElse(DEFAULT_MAX_TRIGGER_DELAY))
 
+  // this allows us to mock system clock for testing purposes
+  private[kafka010] val clock: Clock
+  = if (options.containsKey(MOCK_SYSTEM_TIME)) new MockedSystemClock else new 
SystemClock

Review comment:
       +1 `=` should not be in same indentation with `p`. If it's the only way 
to fit L78 to a single line, please use multi-lines instead, e.g. below:
   
   ```
   private[kafka010] val clock: Clock = if 
(options.containsKey(MOCK_SYSTEM_TIME)) {
     new MockedSystemClock
   } else {
     new SystemClock
   }
   ```
   
   or even 6 lines if the first line exceeds 100 chars.




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