cloud-fan commented on a change in pull request #27653: [MINOR][SQL] Add a 
comment for `removedSQLConfigs`
URL: https://github.com/apache/spark/pull/27653#discussion_r382410179
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
 ##########
 @@ -2254,6 +2254,13 @@ object SQLConf {
    * The map contains info about removed SQL configs. Keys are SQL config 
names,
    * map values contain extra information like the version in which the config 
was removed,
    * config's default value and a comment.
+   *
+   * Removed SQL config should be added to the map iff its non-default value 
changed
+   * the behavior. Any removed config of `removedSQLConfigs` which set to a 
non-default
+   * value raises an exception propagated to user's app. For example, the SQL 
config
+   * `spark.sql.variable.substitute.depth` was deprecated since Spark 2.1 and 
not
+   * used in Spark 2.4, so, it should not be placed here because the config
 
 Review comment:
   actually, we should've put in it remove configs in 2.4...

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