mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-06 08:30:54 +00:00
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
#include <iostream>
|
|
|
|
#include <IO/WriteBufferFromOStream.h>
|
|
#include <Storages/System/StorageSystemNumbers.h>
|
|
#include <DataStreams/LimitBlockInputStream.h>
|
|
#include <Formats/FormatFactory.h>
|
|
#include <DataStreams/copyData.h>
|
|
#include <DataTypes/DataTypesNumber.h>
|
|
#include <Interpreters/Context.h>
|
|
#include <Processors/Executors/TreeExecutorBlockInputStream.h>
|
|
|
|
|
|
int main(int, char **)
|
|
try
|
|
{
|
|
using namespace DB;
|
|
|
|
StoragePtr table = StorageSystemNumbers::create(StorageID("test", "numbers"), false);
|
|
|
|
Names column_names;
|
|
column_names.push_back("number");
|
|
|
|
Block sample;
|
|
ColumnWithTypeAndName col;
|
|
col.type = std::make_shared<DataTypeUInt64>();
|
|
sample.insert(std::move(col));
|
|
|
|
WriteBufferFromOStream out_buf(std::cout);
|
|
|
|
auto context = Context::createGlobal();
|
|
context.makeGlobalContext();
|
|
QueryProcessingStage::Enum stage = table->getQueryProcessingStage(context);
|
|
|
|
auto stream = std::make_shared<TreeExecutorBlockInputStream>(std::move(table->read(column_names, {}, context, stage, 10, 1)[0]));
|
|
LimitBlockInputStream input(stream, 10, 96);
|
|
BlockOutputStreamPtr out = FormatFactory::instance().getOutput("TabSeparated", out_buf, sample, context);
|
|
|
|
copyData(input, *out);
|
|
|
|
return 0;
|
|
}
|
|
catch (const DB::Exception & e)
|
|
{
|
|
std::cerr << e.what() << ", " << e.displayText() << std::endl;
|
|
return 1;
|
|
}
|