cloud-fan commented on a change in pull request #26664: 
[SPARK-9853][Doc][Follow-up] Update the description for all the SQLConf 
affected by spark.sql.adaptive.enabled
URL: https://github.com/apache/spark/pull/26664#discussion_r350308309
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
 ##########
 @@ -355,29 +355,33 @@ object SQLConf {
 
   val SHUFFLE_TARGET_POSTSHUFFLE_INPUT_SIZE =
     buildConf("spark.sql.adaptive.shuffle.targetPostShuffleInputSize")
-      .doc("The target post-shuffle input size in bytes of a task.")
+      .doc("The target post-shuffle input size in bytes of a task. This 
configuration only has " +
+        s"an effect when '${ADAPTIVE_EXECUTION_ENABLED.key}' is enabled.")
 
 Review comment:
   and also when 
`spark.sql.adaptive.shuffle.reducePostShufflePartitions.enabled` is true?

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