1 | #include <Processors/Transforms/ReverseTransform.h> |
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2 | #include <Common/PODArray.h> |
3 | |
4 | namespace DB |
5 | { |
6 | |
7 | void ReverseTransform::transform(Chunk & chunk) |
8 | { |
9 | IColumn::Permutation permutation; |
10 | |
11 | size_t num_rows = chunk.getNumRows(); |
12 | for (size_t i = 0; i < num_rows; ++i) |
13 | permutation.emplace_back(num_rows - 1 - i); |
14 | |
15 | auto columns = chunk.detachColumns(); |
16 | |
17 | for (auto & column : columns) |
18 | column = column->permute(permutation, 0); |
19 | |
20 | chunk.setColumns(std::move(columns), num_rows); |
21 | } |
22 | |
23 | } |
24 |