Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/23054#discussion_r234408150
--- 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 key attribute is wrongly named
as "value" for primitive key type when doing typed aggregation on Dataset. This
attribute is now named as "key" since Spark 3.0 like complex key type.
--- End diff --
Updated as suggestion. Thanks.
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