int main(int argc, char ** argv)
{
using namespace DB;
try
{
size_t n = argc == 2 ? atoi(argv[1]) : 10;
Block block;
ColumnWithTypeAndName column_x;
column_x.name = "x";
column_x.type = std::make_shared<DataTypeInt16>();
auto x = std::make_shared<ColumnInt16>();
column_x.column = x;
auto & vec_x = x->getData();
vec_x.resize(n);
for (size_t i = 0; i < n; ++i)
vec_x[i] = i % 9;
block.insert(column_x);
const char * strings[] = {"abc", "def", "abcd", "defg", "ac"};
ColumnWithTypeAndName column_s1;
column_s1.name = "s1";
column_s1.type = std::make_shared<DataTypeString>();
column_s1.column = std::make_shared<ColumnString>();
for (size_t i = 0; i < n; ++i)
column_s1.column->insert(std::string(strings[i % 5]));
block.insert(column_s1);
ColumnWithTypeAndName column_s2;
column_s2.name = "s2";
column_s2.type = std::make_shared<DataTypeString>();
column_s2.column = std::make_shared<ColumnString>();
for (size_t i = 0; i < n; ++i)
column_s2.column->insert(std::string(strings[i % 3]));
block.insert(column_s2);
BlockInputStreamPtr stream = std::make_shared<OneBlockInputStream>(block);
AggregatedDataVariants aggregated_data_variants;
Names key_column_names;
key_column_names.emplace_back("x");
key_column_names.emplace_back("s1");
AggregateFunctionFactory factory;
AggregateDescriptions aggregate_descriptions(1);
DataTypes empty_list_of_types;
aggregate_descriptions[0].function = factory.get("count", empty_list_of_types);
Aggregator::Params params(key_column_names, aggregate_descriptions, false);
Aggregator aggregator(params);
{
Stopwatch stopwatch;
stopwatch.start();
aggregator.execute(stream, aggregated_data_variants);
stopwatch.stop();
std::cout << std::fixed << std::setprecision(2)
<< "Elapsed " << stopwatch.elapsedSeconds() << " sec."
<< ", " << n / stopwatch.elapsedSeconds() << " rows/sec."
<< std::endl;
}
}
catch (const Exception & e)
{
std::cerr << e.displayText() << std::endl;
}
return 0;
}
int main(int argc, char ** argv)
{
using namespace DB;
try
{
size_t n = argc == 2 ? atoi(argv[1]) : 10;
Block block;
ColumnWithTypeAndName column_x;
column_x.name = "x";
column_x.type = std::make_shared<DataTypeInt16>();
auto x = std::make_shared<ColumnInt16>();
column_x.column = x;
auto & vec_x = x->getData();
vec_x.resize(n);
for (size_t i = 0; i < n; ++i)
vec_x[i] = i % 9;
block.insert(column_x);
const char * strings[] = {"abc", "def", "abcd", "defg", "ac"};
ColumnWithTypeAndName column_s1;
column_s1.name = "s1";
column_s1.type = std::make_shared<DataTypeString>();
column_s1.column = std::make_shared<ColumnString>();
for (size_t i = 0; i < n; ++i)
column_s1.column->insert(std::string(strings[i % 5]));
block.insert(column_s1);
ColumnWithTypeAndName column_s2;
column_s2.name = "s2";
column_s2.type = std::make_shared<DataTypeString>();
column_s2.column = std::make_shared<ColumnString>();
for (size_t i = 0; i < n; ++i)
column_s2.column->insert(std::string(strings[i % 3]));
block.insert(column_s2);
Names key_column_names;
key_column_names.emplace_back("x");
AggregateFunctionFactory factory;
AggregateDescriptions aggregate_descriptions(1);
DataTypes empty_list_of_types;
aggregate_descriptions[0].function = factory.get("count", empty_list_of_types);
DataTypes result_types
{
std::make_shared<DataTypeInt16>(),
// std::make_shared<DataTypeString>(),
std::make_shared<DataTypeUInt64>(),
};
Block sample;
for (DataTypes::const_iterator it = result_types.begin(); it != result_types.end(); ++it)
{
ColumnWithTypeAndName col;
col.type = *it;
sample.insert(std::move(col));
}
Aggregator::Params params(key_column_names, aggregate_descriptions, false);
BlockInputStreamPtr stream = std::make_shared<OneBlockInputStream>(block);
stream = std::make_shared<AggregatingBlockInputStream>(stream, params, true);
WriteBufferFromOStream ob(std::cout);
RowOutputStreamPtr row_out = std::make_shared<TabSeparatedRowOutputStream>(ob, sample);
BlockOutputStreamPtr out = std::make_shared<BlockOutputStreamFromRowOutputStream>(row_out);
{
Stopwatch stopwatch;
stopwatch.start();
copyData(*stream, *out);
stopwatch.stop();
std::cout << std::fixed << std::setprecision(2)
<< "Elapsed " << stopwatch.elapsedSeconds() << " sec."
<< ", " << n / stopwatch.elapsedSeconds() << " rows/sec."
<< std::endl;
}
std::cout << std::endl;
stream->dumpTree(std::cout);
std::cout << std::endl;
}
catch (const Exception & e)
{
std::cerr << e.displayText() << std::endl;
}
return 0;
}