io.questdb.griffin.engine.groupby.vect.MinDoubleVectorAggregateFunction Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
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package io.questdb.griffin.engine.groupby.vect;

import io.questdb.cairo.ArrayColumnTypes;
import io.questdb.cairo.ColumnType;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.engine.functions.DoubleFunction;
import io.questdb.std.Rosti;
import io.questdb.std.Unsafe;
import io.questdb.std.Vect;

import java.util.concurrent.atomic.DoubleAccumulator;
import java.util.function.DoubleBinaryOperator;

import static io.questdb.griffin.SqlCodeGenerator.GKK_HOUR_INT;

public class MinDoubleVectorAggregateFunction extends DoubleFunction implements VectorAggregateFunction {

    public static final DoubleBinaryOperator MIN = Math::min;
    private final DoubleAccumulator min = new DoubleAccumulator(
            MIN, Double.POSITIVE_INFINITY
    );
    private final int columnIndex;
    private final DistinctFunc distinctFunc;
    private final KeyValueFunc keyValueFunc;
    private int valueOffset;

    public MinDoubleVectorAggregateFunction(int position, int keyKind, int columnIndex, int workerCount) {
        super(position);
        this.columnIndex = columnIndex;
        if (keyKind == GKK_HOUR_INT) {
            this.distinctFunc = Rosti::keyedHourDistinct;
            this.keyValueFunc = Rosti::keyedHourMinDouble;
        } else {
            this.distinctFunc = Rosti::keyedIntDistinct;
            this.keyValueFunc = Rosti::keyedIntMinDouble;
        }
    }

    @Override
    public void aggregate(long address, long addressSize, int workerId) {
        if (address != 0) {
            final double value = Vect.minDouble(address, addressSize / Double.BYTES);
            if (value == value) {
                min.accumulate(value);
            }
        }
    }

    @Override
    public void aggregate(long pRosti, long keyAddress, long valueAddress, long valueAddressSize, int workerId) {
        if (valueAddress == 0) {
            // no values? no problem :)
            // create list of distinct key values so that we can show NULL against them
            distinctFunc.run(pRosti, keyAddress, valueAddressSize / Double.BYTES);
        } else {
            keyValueFunc.run(pRosti, keyAddress, valueAddress, valueAddressSize / Double.BYTES, valueOffset);
        }
    }

    @Override
    public int getColumnIndex() {
        return columnIndex;
    }

    @Override
    public int getValueOffset() {
        return valueOffset;
    }

    @Override
    public void initRosti(long pRosti) {
        Unsafe.getUnsafe().putDouble(Rosti.getInitialValueSlot(pRosti, this.valueOffset), Double.POSITIVE_INFINITY);
    }

    @Override
    public void merge(long pRostiA, long pRostiB) {
        Rosti.keyedIntMinDoubleMerge(pRostiA, pRostiB, valueOffset);
    }

    @Override
    public void pushValueTypes(ArrayColumnTypes types) {
        this.valueOffset = types.getColumnCount();
        types.add(ColumnType.DOUBLE);
    }

    @Override
    public void wrapUp(long pRosti) {
        Rosti.keyedIntMinDoubleWrapUp(pRosti, valueOffset, this.min.get());
    }

    @Override
    public void clear() {
        min.reset();
    }

    @Override
    public double getDouble(Record rec) {
        final double min = this.min.get();
        if (Double.isInfinite(min)) {
            return Double.NaN;
        }
        return min;
    }
}