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94 lines
2.4 KiB
C++
94 lines
2.4 KiB
C++
#include <DataStreams/CubeBlockInputStream.h>
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#include <DataStreams/finalizeBlock.h>
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#include <DataTypes/DataTypeAggregateFunction.h>
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#include <Columns/ColumnAggregateFunction.h>
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#include <Columns/FilterDescription.h>
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#include <Common/typeid_cast.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int TOO_MANY_COLUMNS;
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}
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CubeBlockInputStream::CubeBlockInputStream(
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const BlockInputStreamPtr & input_, const Aggregator::Params & params_) : aggregator(params_),
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keys(params_.keys)
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{
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if (keys.size() > 30)
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throw Exception("Too many columns for cube", ErrorCodes::TOO_MANY_COLUMNS);
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children.push_back(input_);
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Aggregator::CancellationHook hook = [this]() { return this->isCancelled(); };
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aggregator.setCancellationHook(hook);
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}
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Block CubeBlockInputStream::getHeader() const
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{
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Block res = children.at(0)->getHeader();
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finalizeBlock(res);
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return res;
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}
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Block CubeBlockInputStream::readImpl()
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{
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/** After reading all blocks from input stream,
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* we will calculate all subsets of columns on next iterations of readImpl
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* by zeroing columns at positions, where bits are zero in current bitmask.
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*/
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if (!is_data_read)
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{
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BlocksList source_blocks;
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while (auto block = children[0]->read())
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source_blocks.push_back(block);
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if (source_blocks.empty())
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return {};
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is_data_read = true;
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mask = (1 << keys.size()) - 1;
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if (source_blocks.size() > 1)
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source_block = aggregator.mergeBlocks(source_blocks, false);
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else
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source_block = std::move(source_blocks.front());
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zero_block = source_block.cloneEmpty();
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for (auto key : keys)
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{
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auto & current = zero_block.getByPosition(key);
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current.column = current.column->cloneResized(source_block.rows());
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}
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auto finalized = source_block;
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finalizeBlock(finalized);
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return finalized;
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}
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if (!mask)
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return {};
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--mask;
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auto cube_block = source_block;
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for (size_t i = 0; i < keys.size(); ++i)
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{
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if (!((mask >> i) & 1))
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{
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size_t pos = keys.size() - i - 1;
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auto & current = cube_block.getByPosition(keys[pos]);
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current.column = zero_block.getByPosition(keys[pos]).column;
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}
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}
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BlocksList cube_blocks = { cube_block };
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Block finalized = aggregator.mergeBlocks(cube_blocks, true);
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return finalized;
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}
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}
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