Github user bravo-zhang commented on the issue: https://github.com/apache/spark/pull/16365 Thanks for the review @HyukjinKwon ! Are your stacktrace of Before and After swapped? Do you mean the message is confusing? How about correcting it to `Failed to merge field longcol: incompatible data types IntegerType and LongType`? For the missing test case, do you mean a merge case that are not `StructType` as in your example? Or is it something else that I'm missing?
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