Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19792
Thanks @ueshin. Yup, +1 for adding some tests.
I just wonder if we could have a similar form of error message in type
verification. I remember I fixed a similar issue for type verification -
https://github.com/apache/spark/pull/18521 (see the links in "Before" and
"After"), for example:
```
field c in field b in field a: can not merge type IntegerType and StringType
element in array element in array field a: can not merge type IntegerType
and StringType
```
Let's make sure there is no performance regression as well (even I was
about to make the mistake before).
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