Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/17251
@cloud-fan .
For the following case, the values of `stack` consists of multiple columns.
Then, by adding *StackCoercion* rule, we need to *insert Cast() for all
NullType*?
```scala
scala> sql("select stack(4, null, 1.0, 'a', true, 2, null, 'b', true, 3,
3.0, null, false, 4, 4.0, 'd', null)").show
+----+----+----+-----+
|col0|col1|col2| col3|
+----+----+----+-----+
|null| 1.0| a| true|
| 2|null| b| true|
| 3| 3.0|null|false|
| 4| 4.0| d| null|
+----+----+----+-----+
```
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