[GitHub] [spark] HyukjinKwon commented on a change in pull request #26918: [SPARK-30279][SQL] Support 32 or more grouping attributes for GROUPING_ID

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HyukjinKwon commented on a change in pull request #26918: [SPARK-30279][SQL] Support 32 or more grouping attributes for GROUPING_ID 
URL: https://github.com/apache/spark/pull/26918#discussion_r387407994
 
 

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 File path: docs/sql-migration-guide.md
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 @@ -341,6 +341,8 @@ license: |
 
     - The decimal string representation can be different between Hive 1.2 and Hive 2.3 when using `TRANSFORM` operator in SQL for script transformation, which depends on hive's behavior. In Hive 1.2, the string representation omits trailing zeroes. But in Hive 2.3, it is always padded to 18 digits with trailing zeroes if necessary.
 
+  - Since Spark 3.0, grouping_id() returns long values. In Spark version 2.4 and earlier, this function returns int values. To restore the behavior before Spark 3.0, you can set `spark.sql.legacy.integerGroupingId` to `true`.
+
 
 Review comment:
   @maropu, how about we just target 3.1 if there's no input .. just to stay safer?

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