81 lines
3.3 KiB
C++
81 lines
3.3 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// This file is copied from
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// https://github.com/ClickHouse/ClickHouse/blob/master/src/Functions/FunctionStringToString.h
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// and modified by Doris
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#pragma once
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#include "vec/columns/column_string.h"
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#include "vec/columns/column_vector.h"
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#include "vec/data_types/data_type_number.h"
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#include "vec/data_types/data_type_string.h"
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#include "vec/functions/function.h"
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#include "vec/functions/function_helpers.h"
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namespace doris::vectorized {
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template <typename Impl, typename Name, bool is_injective = false>
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class FunctionStringToString : public IFunction {
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public:
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static constexpr auto name = Name::name;
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static constexpr bool has_variadic_argument =
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!std::is_void_v<decltype(has_variadic_argument_types(std::declval<Impl>()))>;
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static FunctionPtr create() { return std::make_shared<FunctionStringToString>(); }
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String get_name() const override { return name; }
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size_t get_number_of_arguments() const override { return 1; }
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bool get_is_injective(const Block&) override { return is_injective; }
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DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {
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if (!is_string_or_fixed_string(arguments[0])) {
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LOG(FATAL) << fmt::format("Illegal type {} of argument of function {}",
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arguments[0]->get_name(), get_name());
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}
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return arguments[0];
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}
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bool use_default_implementation_for_constants() const override { return true; }
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DataTypes get_variadic_argument_types_impl() const override {
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if constexpr (has_variadic_argument) return Impl::get_variadic_argument_types();
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return {};
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}
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Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,
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size_t result, size_t input_rows_count) override {
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const ColumnPtr column = block.get_by_position(arguments[0]).column;
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if (const ColumnString* col = check_and_get_column<ColumnString>(column.get())) {
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auto col_res = ColumnString::create();
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Impl::vector(col->get_chars(), col->get_offsets(), col_res->get_chars(),
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col_res->get_offsets());
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block.replace_by_position(result, std::move(col_res));
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} else {
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return Status::RuntimeError("Illegal column {} of argument of function {}",
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block.get_by_position(arguments[0]).column->get_name(),
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get_name());
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}
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return Status::OK();
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}
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};
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} // namespace doris::vectorized
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