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47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#include <Common/Exception.h>
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#include <Columns/ColumnsNumber.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Storages/System/StorageSystemOne.h>
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#include <Processors/Sources/SourceFromSingleChunk.h>
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#include <Processors/Pipe.h>
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namespace DB
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{
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StorageSystemOne::StorageSystemOne(const std::string & name_)
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: IStorage({"system", name_})
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{
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setColumns(ColumnsDescription({{"dummy", std::make_shared<DataTypeUInt8>()}}));
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}
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Pipes StorageSystemOne::read(
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const Names & column_names,
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const SelectQueryInfo &,
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const Context & /*context*/,
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QueryProcessingStage::Enum /*processed_stage*/,
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const size_t /*max_block_size*/,
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const unsigned /*num_streams*/)
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{
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check(column_names);
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Block header{ColumnWithTypeAndName(
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DataTypeUInt8().createColumn(),
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std::make_shared<DataTypeUInt8>(),
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"dummy")};
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auto column = DataTypeUInt8().createColumnConst(1, 0u)->convertToFullColumnIfConst();
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Chunk chunk({ std::move(column) }, 1);
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Pipes pipes;
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pipes.emplace_back(std::make_shared<SourceFromSingleChunk>(std::move(header), std::move(chunk)));
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return pipes;
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}
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}
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