update

Author: BiteTheDDDDt

be/src/vec/common/hash_table/hash_map_context.h

@@ -437,8 +437,8 @@ auto& get_string_hash_table(HashMap& data) {
 
 /// Compile-time key conversion for each sub-table group.
 /// Groups 1-4 use to_string_key<T>(); groups 0 and 5 use StringRef directly.
-/// Returns a pair: (converted_key, needs_copy).
-/// For groups 0 and 5, the key must be a non-const copy (lazy_emplace_if_zero takes Key&).
+/// Returns the converted key for the given group.
+/// For groups 0 and 5, the key is returned as a non-const copy (lazy_emplace_if_zero takes Key&).
 template <int GroupIdx>
 auto convert_key_for_submap(const StringRef& origin) {
     if constexpr (GroupIdx == 0) {