Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18968
After we correctly define the data type of `ListQuery`, can we remove the
special handling of `ListQuery` in `In.checkInputDataTypes`?
we can add `ListQuery.childOutputs: Seq[Attribute]`, so that even we extend
the project list of `ListQuery.plan`, we still keep the corrected data type:
```
def dataType = if (childOutputs.length > 1) childOutputs.toStructType else
childOutputs.head.dataType
```
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