Github user maropu commented on the issue:
https://github.com/apache/spark/pull/19977
I found different behaviours in a string function `elt` though, is this
expected (binray output is a small surprise?);
```
hive> create table t(a binary, b binary);
hive> create view v as select elt(1, a, b) from t;
hive> describe v;
_c0 string
mysql> create table t(a binary, b binary);
mysql> create view v as select elt(1, a, b) from t;
mysql> SHOW COLUMNS FROM v;
+--------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------+--------------+------+-----+---------+-------+
| elt(1, a, b) | varbinary(1) | YES | | NULL | |
+--------------+--------------+------+-----+---------+-------+
1 row in set (0.00 sec)
scala> val df = Seq(("aaa".getBytes, "bbb".getBytes)).toDF("a", "b")
scala> df.selectExpr("elt(1, a, b)").printSchema
root
|-- elt(1, CAST(a AS STRING), CAST(b AS STRING)): string (nullable = true)
```
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