dongjoon-hyun commented on a change in pull request #27580: [SPARK-27619][SQL]MapType should be prohibited in hash expressions URL: https://github.com/apache/spark/pull/27580#discussion_r384915364
########## File path: docs/sql-migration-guide.md ########## @@ -224,6 +224,8 @@ license: | - Since Spark 3.0, when casting string value to integral types(tinyint, smallint, int and bigint), datetime types(date, timestamp and interval) and boolean type, the leading and trailing whitespaces (<= ASCII 32) will be trimmed before converted to these type values, e.g. `cast(' 1\t' as int)` results `1`, `cast(' 1\t' as boolean)` results `true`, `cast('2019-10-10\t as date)` results the date value `2019-10-10`. In Spark version 2.4 and earlier, while casting string to integrals and booleans, it will not trim the whitespaces from both ends, the foregoing results will be `null`, while to datetimes, only the trailing spaces (= ASCII 32) will be removed. + - Since Spark 3.0, An analysis exception will be thrown when hash expressions are applied on elements of MapType. To restore the behavior before Spark 3.0, set `spark.sql.legacy.useHashOnMapType` to true. Review comment: nit. ``` `An` -> `an` to true -> to `true` ``` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org