dongjoon-hyun commented on a change in pull request #22617: 
[SPARK-25484][SQL][TEST] Refactor ExternalAppendOnlyUnsafeRowArrayBenchmark
URL: https://github.com/apache/spark/pull/22617#discussion_r246303032
 
 

 ##########
 File path: 
sql/core/src/test/scala/org/apache/spark/sql/execution/ExternalAppendOnlyUnsafeRowArrayBenchmark.scala
 ##########
 @@ -32,9 +32,10 @@ import 
org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter
  * {{{
  *   1. without sbt:
  *      bin/spark-submit --class <this class> --jars <spark core test jar> 
<spark sql test jar>
- *   2. build/sbt "sql/test:runMain <this class>"
+ *   2. build/sbt build/sbt ";project sql;set javaOptions
+  *  *    in Test += \"-Dspark.memory.debugFill=false\";test:runMain <this 
class>"
  *   3. generate result: SPARK_GENERATE_BENCHMARK_FILES=1 build/sbt ";project 
sql;set javaOptions
- *        in Test -= \"-Dspark.memory.debugFill=true\";test:runMain <this 
class>"
+ *        in Test += \"-Dspark.memory.debugFill=false\";test:runMain <this 
class>"
 
 Review comment:
   Ur, in PR description, `runMain` is repeated twice; `test:runMain 
test:runMain`

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