Github user ooq commented on the issue:
https://github.com/apache/spark/pull/14176
Thanks for the comments @davies @sameeragarwal . This PR has been updated.
Basically the only public boolean flag now is called
`spark.sql.codegen.aggregate.map.twolevel.enable`. There is a separate
non-public flag `spark.sql.codegen.aggregate.map.vectorized.enable` that allows
testing and benchmarking of vectorized hashmap before we remove vectorized
hashmap completely.
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