[feature](struct-type) support basic struct constructor function (#18190)

This commit will support struct and named_struct function.

be/src/vec/functions/function_struct.cpp

@@ -0,0 +1,135 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include "vec/columns/column_const.h"
+#include "vec/columns/column_string.h"
+#include "vec/columns/column_struct.h"
+#include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_nullable.h"
+#include "vec/data_types/data_type_struct.h"
+#include "vec/functions/function.h"
+#include "vec/functions/function_helpers.h"
+#include "vec/functions/simple_function_factory.h"
+
+namespace doris::vectorized {
+
+// construct a struct
+template <typename Impl>
+class FunctionStruct : public IFunction {
+public:
+    static constexpr auto name = Impl::name;
+    static FunctionPtr create() { return std::make_shared<FunctionStruct>(); }
+
+    /// Get function name.
+    String get_name() const override { return name; }
+
+    bool is_variadic() const override { return true; }
+
+    bool use_default_implementation_for_nulls() const override { return false; }
+
+    size_t get_number_of_arguments() const override { return 0; }
+
+    void check_number_of_arguments(size_t number_of_arguments) const override {
+        DCHECK(number_of_arguments > 0)
+                << "function: " << get_name() << ", arguments should not be empty.";
+        return Impl::check_number_of_arguments(number_of_arguments);
+    }
+
+    DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {
+        return Impl::get_return_type_impl(arguments);
+    }
+
+    Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,
+                        size_t result, size_t input_rows_count) override {
+        auto result_col = block.get_by_position(result).type->create_column();
+        auto struct_column = typeid_cast<ColumnStruct*>(result_col.get());
+        if (!struct_column) {
+            return Status::RuntimeError("unsupported types for function {} return {}", get_name(),
+                                        block.get_by_position(result).type->get_name());
+        }
+        ColumnNumbers args_num;
+        for (size_t i = 0; i < arguments.size(); i++) {
+            if (Impl::pred(i)) {
+                args_num.push_back(arguments[i]);
+            }
+        }
+        size_t num_element = args_num.size();
+        if (num_element != struct_column->tuple_size()) {
+            return Status::RuntimeError(
+                    "function {} args number {} is not equal to result struct field number {}.",
+                    get_name(), num_element, struct_column->tuple_size());
+        }
+        for (size_t i = 0; i < num_element; ++i) {
+            auto& nested_col = struct_column->get_column(i);
+            nested_col.reserve(input_rows_count);
+            bool is_nullable = nested_col.is_nullable();
+            auto& col = block.get_by_position(args_num[i]).column;
+            col = col->convert_to_full_column_if_const();
+            if (is_nullable && !col->is_nullable()) {
+                col = ColumnNullable::create(col, ColumnUInt8::create(col->size(), 0));
+            }
+        }
+
+        // insert value into struct column by column
+        for (size_t i = 0; i < num_element; ++i) {
+            struct_column->get_column(i).insert_range_from(
+                    *block.get_by_position(args_num[i]).column, 0, input_rows_count);
+        }
+        block.replace_by_position(result, std::move(result_col));
+        return Status::OK();
+    }
+};
+
+// struct(value1, value2, value3) -> {value1, value2, value3}
+struct StructImpl {
+    static constexpr auto name = "struct";
+    static constexpr auto pred = [](size_t i) { return true; };
+
+    static void check_number_of_arguments(size_t number_of_arguments) {}
+
+    static DataTypePtr get_return_type_impl(const DataTypes& arguments) {
+        return std::make_shared<DataTypeStruct>(make_nullable(arguments));
+    }
+};
+
+// named_struct(name1, value1, name2, value2) -> {name1:value1, name2:value2}
+struct NamedStructImpl {
+    static constexpr auto name = "named_struct";
+    static constexpr auto pred = [](size_t i) { return (i & 1) == 1; };
+
+    static void check_number_of_arguments(size_t number_of_arguments) {
+        DCHECK(number_of_arguments % 2 == 0)
+                << "function: " << name << ", arguments size should be even number.";
+    }
+
+    static DataTypePtr get_return_type_impl(const DataTypes& arguments) {
+        DataTypes data_types(arguments.size() / 2);
+        size_t even_idx = 1;
+        for (size_t i = 0; i < data_types.size(); i++) {
+            data_types[i] = arguments[even_idx];
+            even_idx += 2;
+        }
+        return std::make_shared<DataTypeStruct>(make_nullable(data_types));
+    }
+};
+
+void register_function_struct(SimpleFunctionFactory& factory) {
+    factory.register_function<FunctionStruct<StructImpl>>();
+    factory.register_function<FunctionStruct<NamedStructImpl>>();
+}
+
+} // namespace doris::vectorized