marvinlanhenke commented on code in PR #10748:
URL: https://github.com/apache/datafusion/pull/10748#discussion_r1623275500
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datafusion/physical-plan/src/joins/hash_join.rs:
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@@ -875,23 +875,12 @@ async fn collect_left_input(
// Estimation of memory size, required for hashtable, prior to allocation.
// Final result can be verified using `RawTable.allocation_info()`
- //
- // For majority of cases hashbrown overestimates buckets qty to keep ~1/8
of them empty.
- // This formula leads to overallocation for small tables (< 8 elements)
but fine overall.
- let estimated_buckets = (num_rows.checked_mul(8).ok_or_else(|| {
Review Comment:
Yes, I think this would be the cleanest solution. I wrote a comment in the
issue, since this would require us to change the Accumulator trait; and I'm not
sure we want to do this, for a probably rare edge-case?
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