viirya edited a comment on pull request #32404:
URL: https://github.com/apache/spark/pull/32404#issuecomment-830424043
This is weird:
```
sbt.ForkMain$ForkError: java.lang.RuntimeException: Error while encoding:
java.lang.RuntimeException: Found 2 serialize on class
org.apache.spark.ml.linalg.VectorUDT
newInstance(class org.apache.spark.ml.linalg.VectorUDT).serialize AS value#27
```
Found methods on `org.apache.spark.ml.linalg.VectorUDT` are:
```
method: serialize, WrappedArray(interface org.apache.spark.ml.linalg.Vector)
method: serialize, WrappedArray(class java.lang.Object)
```
But `VectorUDT` only has `override def serialize(obj: Vector): InternalRow`.
Why there is another `serialize(Object)`?
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