ClickHouse/dbms/src/Storages/System/StorageSystemOne.cpp

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#include <Common/Exception.h>
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#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataStreams/OneBlockInputStream.h>
#include <Storages/System/StorageSystemOne.h>
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namespace DB
{
StorageSystemOne::StorageSystemOne(const std::string & name_)
: name(name_)
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{
setColumns(ColumnsDescription({{"dummy", std::make_shared<DataTypeUInt8>()}}));
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}
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BlockInputStreams StorageSystemOne::read(
const Names & column_names,
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const SelectQueryInfo &,
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const Context & context,
QueryProcessingStage::Enum processed_stage,
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const size_t /*max_block_size*/,
const unsigned /*num_streams*/)
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{
check(column_names);
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checkQueryProcessingStage(processed_stage, context);
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return BlockInputStreams(1, std::make_shared<OneBlockInputStream>(
Block{ColumnWithTypeAndName(
DataTypeUInt8().createColumnConst(1, UInt64(0))->convertToFullColumnIfConst(),
std::make_shared<DataTypeUInt8>(),
"dummy")}));
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}
}