Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/18694
Since To register cleanup to a cleanup task may not work as discussed at
#18543, I am a little bit supportive to explicitly free memory as possible.
On the other hand, I think that the current `destruct` implementation looks
time-consuming. Are there any other approaches to free memory and to have less
places to insert `destruct`?
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