Github user dilipbiswal commented on the issue:
https://github.com/apache/spark/pull/18968
@gatorsmile @cloud-fan @viirya I was thinking about cloud-fan's question.
Actually we may not be representing the data type of the listquery expression
correctly. Would this represent this more accurately ?
```sql
override def dataType: DataType =
if (plan.output.length > 1) plan.schema else
plan.schema.fields.head.dataType
```
Actually we don't use the data type to know the return type for listquery
instead we use the plan's output.
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