Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/15780
> this optimization leads to failure of the program Seq((0, 1.0, 3.0), (2,
2.0, 5.0)).toDF("id", "v").printSchema
This is not an optimization, we should use `serializer.schema` as encoder
schema. Can you look into it?
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