Dandandan commented on a change in pull request #9116:
URL: https://github.com/apache/arrow/pull/9116#discussion_r554613035
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File path: rust/datafusion/src/physical_plan/hash_join.rs
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@@ -575,6 +542,199 @@ fn build_join_indexes(
}
}
}
+use core::hash::BuildHasher;
+
+/// `Hasher` that returns the same `u64` value as a hash, to avoid re-hashing
+/// it when inserting/indexing or regrowing the `HashMap`
+struct IdHasher {
+ hash: u64,
Review comment:
We just return the key value here, so we don't "rehash" when growing or
indexing the `HashMap`
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