yaooqinn commented on a change in pull request #28650:
URL: https://github.com/apache/spark/pull/28650#discussion_r431068450
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File path: docs/sql-migration-guide.md
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@@ -27,6 +27,8 @@ license: |
- In Spark 3.1, grouping_id() returns long values. In Spark version 3.0 and
earlier, this function returns int values. To restore the behavior before Spark
3.0, you can set `spark.sql.legacy.integerGroupingId` to `true`.
- In Spark 3.1, SQL UI data adopts the `formatted` mode for the query plan
explain results. To restore the behavior before Spark 3.0, you can set
`spark.sql.ui.explainMode` to `extended`.
+
+ - In Spark 3.1, `from_unixtime` will fail if the specified datetime pattern
is invalid. In Spark 3.0 or earlier, it results `NULL`.
Review comment:
the current PR unifies the behavior of formatting, do we need to apply
this to functions for parsing too?
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