HappenLee commented on code in PR #13039:
URL: https://github.com/apache/doris/pull/13039#discussion_r984146930
##########
be/src/vec/functions/function_timestamp.cpp:
##########
@@ -214,6 +234,90 @@ struct MakeDateImpl {
}
};
+template <typename DateValueType, typename ArgType>
+struct DateTrunc {
+ static constexpr auto name = "date_trunc";
+
+ static bool is_variadic() { return true; }
+
+ static DataTypes get_variadic_argument_types() {
+ if constexpr (std::is_same_v<DateValueType, VecDateTimeValue>) {
+ return {std::make_shared<DataTypeDateTime>(),
std::make_shared<DataTypeString>()};
+ } else {
+ return {std::make_shared<DataTypeDateTimeV2>(),
std::make_shared<DataTypeString>()};
+ }
+ }
+
+ static DataTypePtr get_return_type_impl(const DataTypes& arguments) {
+ if constexpr (std::is_same_v<DateValueType, VecDateTimeValue>) {
+ return make_nullable(std::make_shared<DataTypeDateTime>());
+ } else {
+ return make_nullable(std::make_shared<DataTypeDateTimeV2>());
+ }
+ }
+
+ static Status execute(FunctionContext* context, Block& block, const
ColumnNumbers& arguments,
+ size_t result, size_t input_rows_count) {
+ DCHECK_EQ(arguments.size(), 2);
+ ColumnPtr argument_columns[2];
+ auto null_map = ColumnUInt8::create(input_rows_count, 0);
+ argument_columns[0] =
+
block.get_by_position(arguments[0]).column->convert_to_full_column_if_const();
+ argument_columns[1] =
+
block.get_by_position(arguments[1]).column->convert_to_full_column_if_const();
+ auto datetime_column = static_cast<const
ColumnVector<ArgType>*>(argument_columns[0].get());
+ auto str_column = static_cast<const
ColumnString*>(argument_columns[1].get());
+ auto& rdata = str_column->get_chars();
+ auto& roffsets = str_column->get_offsets();
+
+ ColumnPtr res = nullptr;
+
+ if constexpr (std::is_same_v<DateValueType, VecDateTimeValue>) {
Review Comment:
res = ColumnVector<ArgType>::create();
executeImpl(datetime_column->get_data(), rdata, roffsets,
static_cast<ColumnVector<ArgType>*>(res->assume_mutable().get())->get_data(),
null_map->get_data(), input_rows_count);
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