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If aggregation step is in order, - do not remove underneath sorting step
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@ -219,6 +219,9 @@ private:
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/// (1) aggregation
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if (const AggregatingStep * parent_aggr = typeid_cast<AggregatingStep *>(step_affect_order); parent_aggr)
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{
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if (parent_aggr->inOrder())
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return false;
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auto const & aggregates = parent_aggr->getParams().aggregates;
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for (const auto & aggregate : aggregates)
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{
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