[GitHub] [doris] lsy3993 commented on a diff in pull request #13466: [function](date_function)add new date function 'last_day'

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

lsy3993 commented on code in PR #13466:
URL: https://github.com/apache/doris/pull/13466#discussion_r1000093727


##########
be/src/vec/functions/function_timestamp.cpp:
##########
@@ -569,6 +569,151 @@ class FunctionUnixTimestamp : public IFunction {
     }
 };
 
+template <typename Impl, typename DateType>
+class FunctionDateOrDateTimeToDate : public IFunction {
+public:
+    static constexpr auto name = Impl::name;
+    static FunctionPtr create() {
+        return std::make_shared<FunctionDateOrDateTimeToDate<Impl, DateType>>();
+    }
+
+    String get_name() const override { return name; }
+
+    bool use_default_implementation_for_nulls() const override { return true; }
+
+    bool use_default_implementation_for_constants() const override { return true; }
+
+    size_t get_number_of_arguments() const override { return 1; }
+
+    bool is_variadic() const override { return true; }
+
+    // input DateTime and Date, return Date
+    // input DateTimeV2 and DateV2, return DateV2
+    DataTypePtr get_return_type_impl(const ColumnsWithTypeAndName& arguments) const override {
+        if constexpr (std::is_same_v<DateType, DataTypeDateTime> ||
+                      std::is_same_v<DateType, DataTypeDate>) {
+            return make_nullable(std::make_shared<DataTypeDate>());
+        } else {
+            return make_nullable(std::make_shared<DataTypeDateV2>());
+        }
+    }
+
+    DataTypes get_variadic_argument_types_impl() const override {
+        if constexpr (std::is_same_v<DateType, DataTypeDateTime>) {

Review Comment:
   when I add DataTypeDate there, query will cause be core dump; when I use DataTypeDateTime only, everything will be ok. It's strange and I don't know why.



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