Github user viirya commented on the issue:
https://github.com/apache/spark/pull/21732
At the end of encoder creation? You mean at the end of calling
`ExpressionEncoder.apply()`? But it is used both for top-level encoder e.g.,
`Dataset[Option[Product]]` and non top-level encoder e.g., `Aggregator`'s
encoder. If we flatten it, doesn't it mean for top-level, it is encoded as a
row, not a struct column?
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