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QuestDB is high performance SQL time series database

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
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 *  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
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 *  http://www.apache.org/licenses/LICENSE-2.0
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package io.questdb.griffin.engine.functions.constants;

import io.questdb.cairo.sql.Record;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.engine.functions.DoubleFunction;

public class DoubleConstant extends DoubleFunction implements ConstantFunction {
    public static final DoubleConstant NULL = new DoubleConstant(Double.NaN);

    private final double value;

    public DoubleConstant(double value) {
        this.value = value;
    }

    public static DoubleConstant newInstance(double value) {
        return value == value ? new DoubleConstant(value) : DoubleConstant.NULL;
    }

    @Override
    public double getDouble(Record rec) {
        return value;
    }

    @Override
    public boolean isNullConstant() {
        // NaN is used as a marker for NULL
        // we can't use value != value because it will always be false
        return value != value;
    }

    @Override
    public void toPlan(PlanSink sink) {
        sink.val(value);
    }
}