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24 lines
509 B
C++
24 lines
509 B
C++
#include <Processors/Transforms/ReverseTransform.h>
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#include <Common/PODArray.h>
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namespace DB
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{
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void ReverseTransform::transform(Chunk & chunk)
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{
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IColumn::Permutation permutation;
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size_t num_rows = chunk.getNumRows();
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for (size_t i = 0; i < num_rows; ++i)
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permutation.emplace_back(num_rows - 1 - i);
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auto columns = chunk.detachColumns();
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for (auto & column : columns)
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column = column->permute(permutation, 0);
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chunk.setColumns(std::move(columns), num_rows);
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}
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}
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