dongjoon-hyun commented on issue #25968: 
[SPARK-29291][CORE][SQL][STREAMING][MLLIB] Change procedure-like declaration to 
function + Unit for 2.13
URL: https://github.com/apache/spark/pull/25968#issuecomment-536354081
 
 
   It's huge~ :) nit. Just for consistency, could you add `: Unit` for the 
following three, too?
   
   ```
   $ git grep "run() = {"
   core/src/test/scala/org/apache/spark/SparkContextSuite.scala:    val thread 
= new Thread() { override def run() = {result = 
sc.getLocalProperty("testProperty")}}
   core/src/test/scala/org/apache/spark/SparkContextSuite.scala:      override 
def run() = {sc.setLocalProperty("testProperty", "testValue")}}
   core/src/test/scala/org/apache/spark/SparkContextSuite.scala:      override 
def run() = {result = sc.getLocalProperty("testProperty")}}
   ```

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