vinycalves commented on code in PR #27349:
URL: https://github.com/apache/datafusion/pull/27349#discussion_r4551711924


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datafusion/physical-plan/src/joins/hash_join/exec.rs:
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Review Comment:
   Is the temporary memory allocated by gc() reserved before it runs? And why 
use rows per buffer instead of bytes per buffer for the four-row threshold?



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