// 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.

#pragma once

#include <memory>

#include <string>

#include "common/object_pool.h"

#include "common/status.h"

#include "core/data_type/data_type.h"

#include "core/data_type_serde/data_type_serde.h"

#include "core/field.h"

#include "exprs/vexpr.h"

namespace doris {

class TExprNode;

class Block;

class VExprContext;

class VLiteral : public VExpr {

    ENABLE_FACTORY_CREATOR(VLiteral);

public:

    VLiteral(const TExprNode& node, bool should_init = true)

            : VExpr(node), _expr_name(_data_type->get_name()) {

        if (should_init) {

            Field field;

            field = _data_type->get_field(node);

            _column_ptr = _data_type->create_column_const(1, field);

        }

    }

    VLiteral(const DataTypePtr& type, const Field& field) : VExpr(type, false) {

        _data_type = type;

        _column_ptr = _data_type->create_column_const(1, field);

        _node_type = TExprNodeType::LITERAL;

        _expr_name = _data_type->get_name();

    }

#ifdef BE_TEST

    VLiteral() = default;

    MOCK_FUNCTION std::string value() const;

#endif

    Status prepare(RuntimeState* state, const RowDescriptor& desc, VExprContext* context) override;

    Status execute_column_impl(VExprContext* context, const Block* block, const Selector* selector,

                               size_t count, ColumnPtr& result_column) const override;

    const std::string& expr_name() const override { return _expr_name; }

    std::string debug_string() const override;

    double execute_cost() const override { return 0.0; }

    MOCK_FUNCTION std::string value(const DataTypeSerDe::FormatOptions& options) const;

    const ColumnPtr& get_column_ptr() const { return _column_ptr; }

    const DataTypePtr& get_data_type() const { return _data_type; }

    bool is_literal() const override { return true; }

    bool equals(const VExpr& other) override;

    uint64_t get_digest(uint64_t seed) const override;

    Status clone_node(VExprSPtr* cloned_expr) const override {

        DORIS_CHECK(cloned_expr != nullptr);

        Field field;

        _column_ptr->get(0, field);

        *cloned_expr = VLiteral::create_shared(_data_type, field);

        return Status::OK();

    }

protected:

    VLiteral(const DataTypePtr& type) : VExpr(type, false) {}

    ColumnPtr _column_ptr;

    std::string _expr_name;

};

} // namespace doris