Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/19977#discussion_r157940623 --- Diff: docs/sql-programming-guide.md --- @@ -1780,6 +1780,8 @@ options. - Since Spark 2.3, when either broadcast hash join or broadcast nested loop join is applicable, we prefer to broadcasting the table that is explicitly specified in a broadcast hint. For details, see the section [Broadcast Hint](#broadcast-hint-for-sql-queries) and [SPARK-22489](https://issues.apache.org/jira/browse/SPARK-22489). + - Since Spark 2.3, when all inputs are binary, `functions.concat()` returns an output as binary. Otherwise, it returns as a string. Until Spark 2.3, it always returns as a string despite of input types. --- End diff -- ok
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