oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/meter/function/min/MinFunction.java [144:193]:
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        if (StringUtil.isNotEmpty(remoteData.getDataStrings(2))) {
            setAttr0(remoteData.getDataStrings(2));
        }

        if (StringUtil.isNotEmpty(remoteData.getDataStrings(3))) {
            setAttr1(remoteData.getDataStrings(3));
        }

        if (StringUtil.isNotEmpty(remoteData.getDataStrings(4))) {
            setAttr2(remoteData.getDataStrings(4));
        }

        if (StringUtil.isNotEmpty(remoteData.getDataStrings(5))) {
            setAttr3(remoteData.getDataStrings(5));
        }

        if (StringUtil.isNotEmpty(remoteData.getDataStrings(6))) {
            setAttr4(remoteData.getDataStrings(6));
        }

        if (StringUtil.isNotEmpty(remoteData.getDataStrings(7))) {
            setAttr5(remoteData.getDataStrings(7));
        }
    }

    @Override
    public RemoteData.Builder serialize() {
        final RemoteData.Builder remoteBuilder = RemoteData.newBuilder();
        remoteBuilder.addDataLongs(getValue());
        remoteBuilder.addDataLongs(getTimeBucket());
        remoteBuilder.addDataStrings(getEntityId());
        remoteBuilder.addDataStrings(getServiceId());

        remoteBuilder.addDataStrings(getAttr0() == null ? Const.EMPTY_STRING : getAttr0());
        remoteBuilder.addDataStrings(getAttr1() == null ? Const.EMPTY_STRING : getAttr1());
        remoteBuilder.addDataStrings(getAttr2() == null ? Const.EMPTY_STRING : getAttr2());
        remoteBuilder.addDataStrings(getAttr3() == null ? Const.EMPTY_STRING : getAttr3());
        remoteBuilder.addDataStrings(getAttr4() == null ? Const.EMPTY_STRING : getAttr4());
        remoteBuilder.addDataStrings(getAttr5() == null ? Const.EMPTY_STRING : getAttr5());
        return remoteBuilder;
    }

    @Override
    protected StorageID id0() {
        return new StorageID()
                .append(TIME_BUCKET, getTimeBucket())
                .append(ENTITY_ID, getEntityId());
    }

    @Override
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oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/meter/function/sum/SumFunction.java [126:177]:
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        if (StringUtil.isNotEmpty(remoteData.getDataStrings(2))) {
            setAttr0(remoteData.getDataStrings(2));
        }

        if (StringUtil.isNotEmpty(remoteData.getDataStrings(3))) {
            setAttr1(remoteData.getDataStrings(3));
        }

        if (StringUtil.isNotEmpty(remoteData.getDataStrings(4))) {
            setAttr2(remoteData.getDataStrings(4));
        }

        if (StringUtil.isNotEmpty(remoteData.getDataStrings(5))) {
            setAttr3(remoteData.getDataStrings(5));
        }

        if (StringUtil.isNotEmpty(remoteData.getDataStrings(6))) {
            setAttr4(remoteData.getDataStrings(6));
        }

        if (StringUtil.isNotEmpty(remoteData.getDataStrings(7))) {
            setAttr5(remoteData.getDataStrings(7));
        }
    }

    @Override
    public RemoteData.Builder serialize() {
        final RemoteData.Builder remoteBuilder = RemoteData.newBuilder();

        remoteBuilder.addDataLongs(getValue());
        remoteBuilder.addDataLongs(getTimeBucket());

        remoteBuilder.addDataStrings(getEntityId());
        remoteBuilder.addDataStrings(getServiceId());

        remoteBuilder.addDataStrings(getAttr0() == null ? Const.EMPTY_STRING : getAttr0());
        remoteBuilder.addDataStrings(getAttr1() == null ? Const.EMPTY_STRING : getAttr1());
        remoteBuilder.addDataStrings(getAttr2() == null ? Const.EMPTY_STRING : getAttr2());
        remoteBuilder.addDataStrings(getAttr3() == null ? Const.EMPTY_STRING : getAttr3());
        remoteBuilder.addDataStrings(getAttr4() == null ? Const.EMPTY_STRING : getAttr4());
        remoteBuilder.addDataStrings(getAttr5() == null ? Const.EMPTY_STRING : getAttr5());
        return remoteBuilder;
    }

    @Override
    protected StorageID id0() {
        return new StorageID()
            .append(TIME_BUCKET, getTimeBucket())
            .append(ENTITY_ID, getEntityId());
    }

    @Override
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