io.questdb.griffin.engine.functions.groupby.AvgDoubleGroupByFunction Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
 *
 *  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,
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package io.questdb.griffin.engine.functions.groupby;

import io.questdb.cairo.ArrayColumnTypes;
import io.questdb.cairo.ColumnType;
import io.questdb.cairo.map.MapValue;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.engine.functions.DoubleFunction;
import io.questdb.griffin.engine.functions.GroupByFunction;
import io.questdb.griffin.engine.functions.UnaryFunction;
import io.questdb.std.Numbers;
import org.jetbrains.annotations.NotNull;

public class AvgDoubleGroupByFunction extends DoubleFunction implements GroupByFunction, UnaryFunction {
    private final Function arg;
    private int valueIndex;

    public AvgDoubleGroupByFunction(@NotNull Function arg) {
        this.arg = arg;
    }

    @Override
    public void computeFirst(MapValue mapValue, Record record, long rowId) {
        final double d = arg.getDouble(record);
        if (Numbers.isFinite(d)) {
            mapValue.putDouble(valueIndex, d);
            mapValue.putLong(valueIndex + 1, 1L);
        } else {
            mapValue.putDouble(valueIndex, 0);
            mapValue.putLong(valueIndex + 1, 0);
        }
    }

    @Override
    public void computeNext(MapValue mapValue, Record record, long rowId) {
        final double d = arg.getDouble(record);
        if (Numbers.isFinite(d)) {
            mapValue.addDouble(valueIndex, d);
            mapValue.addLong(valueIndex + 1, 1L);
        }
    }

    @Override
    public Function getArg() {
        return arg;
    }

    @Override
    public double getDouble(Record rec) {
        return rec.getDouble(valueIndex) / rec.getLong(valueIndex + 1);
    }

    @Override
    public String getName() {
        return "avg";
    }

    @Override
    public int getValueIndex() {
        return valueIndex;
    }

    @Override
    public void initValueIndex(int valueIndex) {
        this.valueIndex = valueIndex;
    }

    @Override
    public void initValueTypes(ArrayColumnTypes columnTypes) {
        this.valueIndex = columnTypes.getColumnCount();
        columnTypes.add(ColumnType.DOUBLE);
        columnTypes.add(ColumnType.LONG);
    }

    @Override
    public boolean isConstant() {
        return false;
    }

    @Override
    public boolean isThreadSafe() {
        return UnaryFunction.super.isThreadSafe();
    }

    @Override
    public void merge(MapValue destValue, MapValue srcValue) {
        double srcSum = srcValue.getDouble(valueIndex);
        long srcCount = srcValue.getLong(valueIndex + 1);
        double destSum = destValue.getDouble(valueIndex);
        long destCount = destValue.getLong(valueIndex + 1);
        destValue.putDouble(valueIndex, destSum + srcSum);
        destValue.putLong(valueIndex + 1, destCount + srcCount);
    }

    @Override
    public void setDouble(MapValue mapValue, double value) {
        mapValue.putDouble(valueIndex, value);
        mapValue.putLong(valueIndex + 1, 1L);
    }

    @Override
    public void setNull(MapValue mapValue) {
        mapValue.putDouble(valueIndex, Double.NaN);
        mapValue.putLong(valueIndex + 1, 0);
    }

    @Override
    public boolean supportsParallelism() {
        return UnaryFunction.super.supportsParallelism();
    }
}