HappenLee commented on code in PR #33243:
URL: https://github.com/apache/doris/pull/33243#discussion_r1567000411
##########
be/src/vec/functions/function_string.h:
##########
@@ -3914,4 +3914,129 @@ class FunctionIntToChar : public IFunction {
#endif
}
};
+
+class FunctionStrInsert : public IFunction {
+public:
+ static constexpr auto name = "str_insert";
+ static FunctionPtr create() { return
std::make_shared<FunctionStrInsert>(); }
+ String get_name() const override { return name; }
+ size_t get_number_of_arguments() const override { return 4; }
+
+ DataTypePtr get_return_type_impl(const DataTypes& arguments) const
override {
+ return std::make_shared<DataTypeString>();
+ }
+
+ Status execute_impl(FunctionContext* context, Block& block, const
ColumnNumbers& arguments,
+ size_t result, size_t input_rows_count) const override
{
+ DCHECK_EQ(arguments.size(), 4);
+
+ bool col_const[4];
+ ColumnPtr argument_columns[4];
+ for (int i = 0; i < 4; ++i) {
+ std::tie(argument_columns[i], col_const[i]) =
+
unpack_if_const(block.get_by_position(arguments[i]).column);
+ }
+ argument_columns[0] = col_const[0] ? static_cast<const ColumnConst&>(
+
*block.get_by_position(arguments[0]).column)
+ .convert_to_full_column()
+ :
block.get_by_position(arguments[0]).column;
+
+ default_preprocess_parameter_columns(argument_columns, col_const, {1,
2, 3}, block,
+ arguments);
+
+ const auto* col_origin = assert_cast<const
ColumnString*>(argument_columns[0].get());
+
+ const auto* col_pos = assert_cast<const
ColumnVector<Int32>*>(argument_columns[1].get())
+ ->get_data()
+ .data();
+ const auto* col_len = assert_cast<const
ColumnVector<Int32>*>(argument_columns[2].get())
+ ->get_data()
+ .data();
+ const auto* col_insert = assert_cast<const
ColumnString*>(argument_columns[3].get());
+
+ ColumnString::MutablePtr col_res = ColumnString::create();
+
+ if (col_const[1] && col_const[2] && col_const[3]) {
+ vector_const(col_origin, col_pos, col_len, col_insert, col_res,
input_rows_count);
+ } else {
+ vector(col_origin, col_pos, col_len, col_insert, col_res,
input_rows_count);
+ }
+
+ block.replace_by_position(result, std::move(col_res));
+ return Status::OK();
+ }
+
+private:
+ // get the new str size
+ static std::pair<bool, size_t> get_size(size_t& str_size, int& pos, int&
len,
+ size_t& ins_size) {
+ if (pos > str_size || pos < 1) {
+ return {true, str_size};
+ }
+ if (len < 0 || pos + len - 1 >= str_size) {
+ len = str_size - pos + 1;
+ return {false, pos + ins_size - 1};
+ }
+ return {false, str_size - len + ins_size};
+ }
+
+ static void vector_const(const ColumnString* col_origin, int const*
col_pos, int const* col_len,
+ const ColumnString* col_insert,
ColumnString::MutablePtr& col_res,
+ size_t input_rows_count) {
+ auto& col_res_chars = col_res->get_chars();
+ auto& col_res_offsets = col_res->get_offsets();
+ StringRef origin_str;
+ StringRef insert_str = col_insert->get_data_at(0);
+ auto pos = col_pos[0];
+ for (size_t i = 0; i < input_rows_count; i++) {
+ origin_str = col_origin->get_data_at(i);
+ auto len = col_len[0];
Review Comment:
the len is const, why get the value in for loop ?
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