// 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/exprs/vliteral.h"

#include <fmt/format.h>

#include <gen_cpp/Exprs_types.h>

#include <gen_cpp/Types_types.h>

#include <glog/logging.h>

#include <sys/types.h>

#include <algorithm>

#include <ostream>

#include "vec/aggregate_functions/aggregate_function.h"

#include "vec/columns/column.h"

#include "vec/core/block.h"

#include "vec/core/field.h"

#include "vec/core/types.h"

#include "vec/data_types/data_type_decimal.h"

namespace doris::vectorized {

#include "common/compile_check_begin.h"

class VExprContext;

void VLiteral::init(const TExprNode& node) {

    Field field;

    field = _data_type->get_field(node);

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

}

Status VLiteral::prepare(RuntimeState* state, const RowDescriptor& desc, VExprContext* context) {

    RETURN_IF_ERROR_OR_PREPARED(VExpr::prepare(state, desc, context));

    return Status::OK();

}

Status VLiteral::execute(VExprContext* context, vectorized::Block* block, int* result_column_id) {

    // Literal expr should return least one row.

    // sometimes we just use a VLiteral without open or prepare. so can't check it at this moment

    size_t row_size = std::max(block->rows(), _column_ptr->size());

    *result_column_id = VExpr::insert_param(block, {_column_ptr, _data_type, _expr_name}, row_size);

    return Status::OK();

}

std::string VLiteral::value() const {

    DCHECK(_column_ptr->size() == 1);

    return _data_type->to_string(*_column_ptr, 0);

}

std::string VLiteral::debug_string() const {

    std::stringstream out;

    out << "VLiteral (name = " << _expr_name;

    out << ", type = " << _data_type->get_name();

    out << ", value = (" << value();

    out << "))";

    return out.str();

}

bool VLiteral::equals(const VExpr& other) {

    const auto* other_ptr = dynamic_cast<const VLiteral*>(&other);

    if (!other_ptr) {

        return false;

    }

    if (this->_expr_name != other_ptr->_expr_name) {

        return false;

    }

    if (this->_column_ptr->structure_equals(*other_ptr->_column_ptr)) {

        if (this->_column_ptr->size() != other_ptr->_column_ptr->size()) {

            return false;

        }

        for (size_t i = 0; i < this->_column_ptr->size(); i++) {

            if (this->_column_ptr->compare_at(i, i, *other_ptr->_column_ptr, -1) != 0) {

                return false;

            }

        }

    }

    return true;

}

#include "common/compile_check_end.h"

} // namespace doris::vectorized