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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
 *
 *  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.map.MapValue;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.std.Numbers;
import org.jetbrains.annotations.NotNull;

public class FirstNotNullStrGroupByFunction extends FirstStrGroupByFunction {

    public FirstNotNullStrGroupByFunction(@NotNull Function arg) {
        super(arg);
    }

    @Override
    public void computeNext(MapValue mapValue, Record record, long rowId) {
        if (mapValue.getBool(valueIndex + 2)) {
            final CharSequence val = arg.getStrA(record);
            if (val != null) {
                mapValue.putLong(valueIndex, rowId);
                long ptr = mapValue.getLong(valueIndex + 1);
                sink.of(ptr).clearAndSet(val);
                mapValue.putLong(valueIndex + 1, sink.colouredPtr());
                mapValue.putBool(valueIndex + 2, false);
            }
        }
    }

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

    @Override
    public void merge(MapValue destValue, MapValue srcValue) {
        if (srcValue.getBool(valueIndex + 2)) {
            return;
        }
        long srcRowId = srcValue.getLong(valueIndex);
        long destRowId = destValue.getLong(valueIndex);
        // srcRowId is non-null at this point since we know that the value is non-null
        if (srcRowId < destRowId || destRowId == Numbers.LONG_NULL) {
            destValue.putLong(valueIndex, srcRowId);
            destValue.putLong(valueIndex + 1, srcValue.getLong(valueIndex + 1));
            destValue.putBool(valueIndex + 2, false);
        }
    }
}