Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/23031#discussion_r234314374
--- Diff: docs/sql-migration-guide-upgrade.md ---
@@ -17,6 +17,8 @@ displayTitle: Spark SQL Upgrading Guide
- The `ADD JAR` command previously returned a result set with the single
value 0. It now returns an empty result set.
+ - In Spark version 2.4 and earlier, the `SET` command works without any
warnings even if the specified key is for `SparkConf` entries and it has no
effect because the command does not update `SparkConf`, but the behavior might
confuse users. Since 3.0, the command fails if a non-SQL or static SQL config
key is used. You can disable such a check by setting
`spark.sql.execution.setCommandRejectsSparkConfs` to `false`.
--- End diff --
Now that I looked at that code again, the static config part already threw
an error before, so probably can be removed here.
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