Gabriel39 commented on code in PR #9663:
URL: https://github.com/apache/incubator-doris/pull/9663#discussion_r877852699
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be/src/vec/common/columns_hashing_impl.h:
##########
@@ -132,12 +132,25 @@ class HashMethodBase {
return emplaceImpl(key_holder, data);
}
+ template <typename Data>
+ ALWAYS_INLINE EmplaceResult emplace_key(Data& data, size_t row, size_t
hash_value,
+ Arena& pool) {
+ auto key_holder = static_cast<Derived&>(*this).get_key_holder(row,
pool);
Review Comment:
`get_key_holder` will cause memory copy for join keys. But this copy happens
twice which will hurt performance. First we copy the keys to compute hash value
for it and then emplace_key here which also copies keys. We should simplify
this behavior.
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