src/paimon/common/predicate/not_equal.h

/*
 * Copyright 2024-present Alibaba Inc.
 *
 * Licensed 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 <cstdint>
#include <optional>
#include <string>
#include <utility>

#include "paimon/common/predicate/null_false_leaf_binary_function.h"
#include "paimon/predicate/literal.h"
#include "paimon/result.h"

namespace paimon {
class LeafFunction;

/// A `NullFalseLeafBinaryFunction` to eval not equal.
class NotEqual : public NullFalseLeafBinaryFunction {
 public:
    static const NotEqual& Instance() {
        static const NotEqual instance = NotEqual();
        return instance;
    }

    Result<bool> Test(const Literal& field, const Literal& literal) const override {
        PAIMON_ASSIGN_OR_RAISE(int32_t compare_res, field.CompareTo(literal));
        return compare_res != 0;
    }
    Result<bool> Test(int64_t row_count, const Literal& min_value, const Literal& max_value,
                      const std::optional<int64_t>& null_count,
                      const Literal& literal) const override {
        PAIMON_ASSIGN_OR_RAISE(int32_t min_res, literal.CompareTo(min_value));
        PAIMON_ASSIGN_OR_RAISE(int32_t max_res, literal.CompareTo(max_value));
        return min_res != 0 || max_res != 0;
    }
    Type GetType() const override {
        return Type::NOT_EQUAL;
    }
    const LeafFunction& Negate() const override;
    std::string ToString() const override {
        return "NotEqual";
    }

 private:
    NotEqual() = default;
};

}  // namespace paimon