Github user maropu commented on the issue:
https://github.com/apache/spark/pull/21581
BTW, I found the other 3 similar issues there;
```
scala> Seq((Seq(1, 2, 3), 2)).toDF("a", "b").selectExpr("array_position(a,
b)").show
+--------------------+
|array_position(a, b)|
+--------------------+
| 2|
+--------------------+
scala> Seq((Seq(1, 2, 3), 2)).toDF("a", "b").selectExpr("element_at(a,
b)").show
+----------------+
|element_at(a, b)|
+----------------+
| 2|
+----------------+
scala> Seq((Seq(1, 2, 3), 2)).toDF("a", "b").selectExpr("array_remove(a,
b)").show
+------------------+
|array_remove(a, b)|
+------------------+
| [1, 3]|
+------------------+
```
I think this is a tiny fix, so IMHO this pr might need to address all the
issues here. cc: @ueshin
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