cpp-ch/local-engine/Operator/StreamingAggregatingStep.cpp [261:273]:
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static DB::ITransformingStep::Traits getTraits()
{
    return DB::ITransformingStep::Traits
    {
        {
            .preserves_number_of_streams = false,
            .preserves_sorting = false,
        },
        {
            .preserves_number_of_rows = false,
        }
    };
}
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cpp-ch/local-engine/Operator/GraceMergingAggregatedStep.cpp [36:48]:
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static DB::ITransformingStep::Traits getTraits()
{
    return DB::ITransformingStep::Traits
    {
        {
            .preserves_number_of_streams = false,
            .preserves_sorting = false,
        },
        {
            .preserves_number_of_rows = false,
        }
    };
}
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