Github user michalsenkyr commented on the issue:
https://github.com/apache/spark/pull/16541
Added codegen comparison for a simple `List` dataset.
I will also prepare a benchmark and add some results later. Those will be
for `List`, `mutable.Queue` and `Seq`. Where `List` and `mutable.Queue` should
benefit from the change (one less pass) and `Seq` should be approximately same
(as it is a supertype of `WrappedArray` and therefore skips the final
conversion in the original approach).
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