Github user ooq commented on the issue:
https://github.com/apache/spark/pull/14176
Thanks for the comments @clockfly ! As per discussion with @sameeragarwal,
I think the plan is to give users the option to turn on/off two-level hashmap.
This is why we have this first level logic for enabling two-level/fast map. We
also want to keep both impls (vectorized /row-based) for a while before
deleting vectorized in the future, which leads to the internal flags that pick
between the two impls. If you guys decide otherwise, I'm happy to update the PR
accordingly. @clockfly @sameeragarwal @davies Thanks!
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