HappenLee commented on code in PR #14555:
URL: https://github.com/apache/doris/pull/14555#discussion_r1033109612
##########
be/src/vec/functions/function_string.h:
##########
@@ -1950,4 +1956,71 @@ struct SubReplaceFourImpl {
}
};
+class FunctionConvertTo : public IFunction {
+public:
+ static constexpr auto name = "convert_to";
+
+ static FunctionPtr create() { return
std::make_shared<FunctionConvertTo>(); }
+
+ String get_name() const override { return name; }
+
+ size_t get_number_of_arguments() const override { return 2; }
+
+ DataTypePtr get_return_type_impl(const DataTypes& /*arguments*/) const
override {
+ return std::make_shared<DataTypeString>();
+ }
+
+ bool use_default_implementation_for_constants() const override { return
true; }
+
+ Status execute_impl(FunctionContext* /*context*/, Block& block, const
ColumnNumbers& arguments,
+ size_t result, size_t input_rows_count) override {
+ ColumnPtr argument_columns[2];
+ 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;
+ const ColumnString* str_col = static_cast<const
ColumnString*>(argument_columns[0].get());
+ const auto& character_data =
+ reinterpret_cast<const
ColumnConst&>(*argument_columns[1]).get_data_at(0);
+ const auto& str_offset = str_col->get_offsets();
+ const auto& str_chars = str_col->get_chars();
+ auto col_res = ColumnString::create();
+ auto& res_offset = col_res->get_offsets();
+ auto& res_chars = col_res->get_chars();
+ res_offset.resize(input_rows_count);
+
+ if (character_data.to_string_view().compare("gbk") == 0) {
+ iconv_t cd = iconv_open("gb2312", "utf-8");
Review Comment:
maybe the variable should be function context, only judge one time
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