Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19977#discussion_r157940412
--- 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 --
also mention the config
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