Github user michalsenkyr commented on the issue:
https://github.com/apache/spark/pull/16240
Possible optimization: Instead of conversions using `to`, we can use
`Builder`s. This way we could get rid of the conversion overhead. This would
require adding a new codegen method that would operate similarly to
`MapObjects` but use a provided `Builder` to build the collection directly.
I will wait for a response to this PR before attempting any more
modifications.
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