[GitHub] [doris] Yukang-Lian commented on a diff in pull request #13056: [Feature](Retention) support retention function

[GitBox <gi...@apache.org>]

Yukang-Lian commented on code in PR #13056:
URL: https://github.com/apache/doris/pull/13056#discussion_r989910566


##########
be/src/exprs/aggregate_functions.cpp:
##########
@@ -2534,6 +2535,97 @@ IntVal AggregateFunctions::window_funnel_finalize(FunctionContext* ctx, const St
     return doris_udf::IntVal(val);
 }
 
+// Refer to AggregateFunctionRetention.h in https://github.com/ClickHouse/ClickHouse.git
+struct RetentionState {
+    static constexpr size_t max_events = 32;
+    std::bitset<max_events> events;
+
+    RetentionState() {}
+
+    void add(int event) { events.set(event); }
+
+    void merge(RetentionState* other) { events |= other->events; }
+
+    BooleanVal* getRetentionData() {
+        static BooleanVal data_to[max_events];
+        int current_offset = 0;
+
+        const bool first_flag = events.test(0);
+        data_to[current_offset] = first_flag;
+        ++current_offset;
+
+        for (size_t i = 1; i < events.size(); ++i) {
+            data_to[current_offset] = (first_flag && events.test(i));
+            ++current_offset;
+        }
+        return data_to;
+    }
+
+    int64_t serizlized_size() { return sizeof(events); }
+
+    void serialize(uint8_t* buf) {
+        memcpy(buf, &events, sizeof(events));

Review Comment:
   will do.



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