github-actions[bot] commented on code in PR #25493:
URL: https://github.com/apache/doris/pull/25493#discussion_r1361616411
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be/src/vec/common/hash_table/hash_map.h:
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@@ -193,10 +195,82 @@ class HashMapTable : public HashTable<Key, Cell, Hash,
Grower, Allocator> {
bool has_null_key_data() const { return false; }
};
+template <typename Key, typename Cell, typename Hash = DefaultHash<Key>,
+ typename Grower = HashTableGrower<>, typename Allocator =
HashTableAllocator>
+class JoinHashMapTable : public HashMapTable<Key, Cell, Hash, Grower,
Allocator> {
+public:
+ using Self = JoinHashMapTable;
+ using Base = HashMapTable<Key, Cell, Hash, Grower, Allocator>;
+
+ using key_type = Key;
+ using value_type = typename Cell::value_type;
+ using mapped_type = typename Cell::Mapped;
+
+ using LookupResult = typename Base::LookupResult;
+
+ using HashMapTable<Key, Cell, Hash, Grower, Allocator>::HashMapTable;
+
+ void expanse_for_add_elem(size_t num_elem) {
+ bucket_size = calc_bucket_size(num_elem + 1);
+ first.resize(bucket_size, 0);
+ }
+
+ static uint32_t calc_bucket_size(size_t num_elem) {
+ size_t expect_bucket_size = static_cast<size_t>(num_elem) + (num_elem
- 1) / 7;
+ return phmap::priv::NormalizeCapacity(expect_bucket_size) + 1;
+ }
+
+ void build(const Key* __restrict keys, const size_t* __restrict
hash_values, int num_elem) {
+ build_keys = keys;
+ next.resize(num_elem);
+ for (size_t i = 1; i < num_elem; i++) {
+ uint32_t bucket_num = hash_values[i] & (bucket_size - 1);
+ next[i] = first[bucket_num];
+ first[bucket_num] = i;
+ }
+ }
+
+ uint32_t bucket_num(const Key& key) const { return Base::hash(key) &
(bucket_size - 1); }
+
+ LookupResult ALWAYS_INLINE find(Key key) { return Base::find(key); }
+ LookupResult ALWAYS_INLINE find(Key x, size_t hash_value) { return
Base::find(x, hash_value); }
+
+ auto find_batch(const Key* __restrict keys, const size_t* __restrict
hash_values, int probe_idx,
+ int probe_rows, std::vector<uint32_t>& probe_idxs,
+ std::vector<int>& build_idxs) {
+ auto matched_cnt = 0;
+ while (probe_idx < probe_rows && matched_cnt < 4096) {
Review Comment:
warning: 4096 is a magic number; consider replacing it with a named constant
[readability-magic-numbers]
```cpp
while (probe_idx < probe_rows && matched_cnt < 4096) {
^
```
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