kosiew commented on code in PR #23343:
URL: https://github.com/apache/datafusion/pull/23343#discussion_r3549096679


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datafusion/physical-plan/src/aggregates/group_values/multi_group_by/primitive.rs:
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@@ -83,6 +83,9 @@ where
 

Review Comment:
   Nice work here. One small test suggestion: it might be worth adding a 
regression test where some `equal_to_results` bits are already set to `false`, 
and the matching `lhs_rows` or `rhs_rows` entries would panic if they were read.
   
   That would make it really clear that `vectorized_equal_to` skips those rows 
as intended, instead of only preserving the existing false bits by coincidence.



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