itholic commented on PR #39891:
URL: https://github.com/apache/spark/pull/39891#issuecomment-1418334421
> MERGE is a SQL Statement, so the term is very confusing.
I agree with that.
Actually the term MERGE here means that `merge` function of `StructType`
(`StructType.merge`).
So, seems like it's `StructType` specific error message.
> Can you explain when this error is being raised?
The `StructType.merge` requires two `StructType` to be merged together.
When merging the two `StructType`, it raises error if If both schemas don't
match.
Btw, on my second thought, it seems to be a private function so can't be
used in user space ??
```scala
scala> StructType.merge(left, right)
<console>:29: error: method merge in object StructType cannot be accessed in
object org.apache.spark.sql.types.StructType
StructType.merge(left, right)
```
cc @MaxGekk @cloud-fan Would you confirm if we should switched this error
into internal error ??
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