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/*
 * 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.
 */

package org.dinky.shaded.paimon.predicate;

import org.dinky.shaded.paimon.format.FieldStats;
import org.dinky.shaded.paimon.types.DataType;

import java.util.List;
import java.util.Optional;

/** A {@link NullFalseLeafBinaryFunction} to eval is not null. */
public class IsNotNull extends LeafUnaryFunction {

    public static final IsNotNull INSTANCE = new IsNotNull();

    private IsNotNull() {}

    @Override
    public boolean test(DataType type, Object field) {
        return field != null;
    }

    @Override
    public boolean test(DataType type, long rowCount, FieldStats fieldStats) {
        Long nullCount = fieldStats.nullCount();
        return nullCount == null || nullCount < rowCount;
    }

    @Override
    public Optional negate() {
        return Optional.of(IsNull.INSTANCE);
    }

    @Override
    public  T visit(FunctionVisitor visitor, FieldRef fieldRef, List