int main(int argc, char ** argv)
try
{
using namespace DB;
size_t n = argc == 2 ? parse<UInt64>(argv[1]) : 10ULL;
std::string input = "SELECT number, number / 3, number * number";
ParserSelectQuery parser;
ASTPtr ast = parseQuery(parser, input.data(), input.data() + input.size(), "");
Context context;
ExpressionAnalyzer analyzer(ast, context, {}, {NameAndTypePair("number", std::make_shared<DataTypeUInt64>())});
ExpressionActionsChain chain;
analyzer.appendSelect(chain, false);
analyzer.appendProjectResult(chain, false);
chain.finalize();
ExpressionActionsPtr expression = chain.getLastActions();
StoragePtr table = StorageSystemNumbers::create("Numbers");
Names column_names;
column_names.push_back("number");
QueryProcessingStage::Enum stage;
BlockInputStreamPtr in;
in = table->read(column_names, 0, context, Settings(), stage)[0];
in = std::make_shared<ExpressionBlockInputStream>(in, expression);
in = std::make_shared<LimitBlockInputStream>(in, 10, std::max(static_cast<Int64>(0), static_cast<Int64>(n) - 10));
WriteBufferFromOStream out1(std::cout);
RowOutputStreamPtr out2 = std::make_shared<TabSeparatedRowOutputStream>(out1, expression->getSampleBlock());
BlockOutputStreamFromRowOutputStream out(out2);
{
Stopwatch stopwatch;
stopwatch.start();
copyData(*in, out);
stopwatch.stop();
std::cout << std::fixed << std::setprecision(2)
<< "Elapsed " << stopwatch.elapsedSeconds() << " sec."
<< ", " << n / stopwatch.elapsedSeconds() << " rows/sec."
<< std::endl;
}
return 0;
}
catch (const DB::Exception & e)
{
std::cerr << e.what() << ", " << e.displayText() << std::endl;
throw;
}
int main(int argc, char ** argv)
{
using namespace DB;
try
{
NamesAndTypesList names_and_types_list
{
{"WatchID", std::make_shared<DataTypeUInt64>()},
{"JavaEnable", std::make_shared<DataTypeUInt8>()},
{"Title", std::make_shared<DataTypeString>()},
{"EventTime", std::make_shared<DataTypeDateTime>()},
{"CounterID", std::make_shared<DataTypeUInt32>()},
{"ClientIP", std::make_shared<DataTypeUInt32>()},
{"RegionID", std::make_shared<DataTypeUInt32>()},
{"UniqID", std::make_shared<DataTypeUInt64>()},
{"CounterClass", std::make_shared<DataTypeUInt8>()},
{"OS", std::make_shared<DataTypeUInt8>()},
{"UserAgent", std::make_shared<DataTypeUInt8>()},
{"URL", std::make_shared<DataTypeString>()},
{"Referer", std::make_shared<DataTypeString>()},
{"ResolutionWidth", std::make_shared<DataTypeUInt16>()},
{"ResolutionHeight", std::make_shared<DataTypeUInt16>()},
{"ResolutionDepth", std::make_shared<DataTypeUInt8>()},
{"FlashMajor", std::make_shared<DataTypeUInt8>()},
{"FlashMinor", std::make_shared<DataTypeUInt8>()},
{"FlashMinor2", std::make_shared<DataTypeString>()},
{"NetMajor", std::make_shared<DataTypeUInt8>()},
{"NetMinor", std::make_shared<DataTypeUInt8>()},
{"UserAgentMajor", std::make_shared<DataTypeUInt16>()},
{"UserAgentMinor", std::make_shared<DataTypeFixedString>(2)},
{"CookieEnable", std::make_shared<DataTypeUInt8>()},
{"JavascriptEnable", std::make_shared<DataTypeUInt8>()},
{"IsMobile", std::make_shared<DataTypeUInt8>()},
{"MobilePhone", std::make_shared<DataTypeUInt8>()},
{"MobilePhoneModel", std::make_shared<DataTypeString>()},
{"Params", std::make_shared<DataTypeString>()},
{"IPNetworkID", std::make_shared<DataTypeUInt32>()},
{"TraficSourceID", std::make_shared<DataTypeInt8>()},
{"SearchEngineID", std::make_shared<DataTypeUInt16>()},
{"SearchPhrase", std::make_shared<DataTypeString>()},
{"AdvEngineID", std::make_shared<DataTypeUInt8>()},
{"IsArtifical", std::make_shared<DataTypeUInt8>()},
{"WindowClientWidth", std::make_shared<DataTypeUInt16>()},
{"WindowClientHeight", std::make_shared<DataTypeUInt16>()},
{"ClientTimeZone", std::make_shared<DataTypeInt16>()},
{"ClientEventTime", std::make_shared<DataTypeDateTime>()},
{"SilverlightVersion1", std::make_shared<DataTypeUInt8>()},
{"SilverlightVersion2", std::make_shared<DataTypeUInt8>()},
{"SilverlightVersion3", std::make_shared<DataTypeUInt32>()},
{"SilverlightVersion4", std::make_shared<DataTypeUInt16>()},
{"PageCharset", std::make_shared<DataTypeString>()},
{"CodeVersion", std::make_shared<DataTypeUInt32>()},
{"IsLink", std::make_shared<DataTypeUInt8>()},
{"IsDownload", std::make_shared<DataTypeUInt8>()},
{"IsNotBounce", std::make_shared<DataTypeUInt8>()},
{"FUniqID", std::make_shared<DataTypeUInt64>()},
{"OriginalURL", std::make_shared<DataTypeString>()},
{"HID", std::make_shared<DataTypeUInt32>()},
{"IsOldCounter", std::make_shared<DataTypeUInt8>()},
{"IsEvent", std::make_shared<DataTypeUInt8>()},
{"IsParameter", std::make_shared<DataTypeUInt8>()},
{"DontCountHits", std::make_shared<DataTypeUInt8>()},
{"WithHash", std::make_shared<DataTypeUInt8>()},
};
Context context;
std::string input = "SELECT UniqID, URL, CounterID, IsLink WHERE URL = 'http://mail.yandex.ru/neo2/#inbox'";
ParserSelectQuery parser;
ASTPtr ast = parseQuery(parser, input.data(), input.data() + input.size(), "");
formatAST(*ast, std::cerr);
std::cerr << std::endl;
std::cerr << ast->getTreeID() << std::endl;
/// create an object of an existing hit log table
StoragePtr table = StorageLog::create("./", "HitLog", std::make_shared<NamesAndTypesList>(names_and_types_list));
/// read from it, apply the expression, filter, and write in tsv form to the console
ExpressionAnalyzer analyzer(ast, context, nullptr, names_and_types_list);
ExpressionActionsChain chain;
analyzer.appendSelect(chain, false);
analyzer.appendWhere(chain, false);
chain.finalize();
ExpressionActionsPtr expression = chain.getLastActions();
Names column_names
{
"UniqID",
"URL",
"CounterID",
"IsLink",
};
QueryProcessingStage::Enum stage;
BlockInputStreamPtr in = table->read(column_names, 0, context, stage)[0];
in = std::make_shared<FilterBlockInputStream>(in, expression, 4);
//in = std::make_shared<LimitBlockInputStream>(in, 10, 0);
WriteBufferFromOStream ob(std::cout);
RowOutputStreamPtr out_ = std::make_shared<TabSeparatedRowOutputStream>(ob, expression->getSampleBlock());
BlockOutputStreamFromRowOutputStream out(out_);
copyData(*in, out);
}
catch (const Exception & e)
{
std::cerr << e.what() << ", " << e.displayText() << std::endl;
return 1;
}
return 0;
}
int main(int argc, char ** argv)
try
{
using namespace DB;
std::string input = "SELECT number, number % 10000000 == 1";
ParserSelectQuery parser;
ASTPtr ast = parseQuery(parser, input.data(), input.data() + input.size(), "");
formatAST(*ast, std::cerr);
std::cerr << std::endl;
Context context;
ExpressionAnalyzer analyzer(ast, context, {}, {NameAndTypePair("number", std::make_shared<DataTypeUInt64>())});
ExpressionActionsChain chain;
analyzer.appendSelect(chain, false);
analyzer.appendProjectResult(chain, false);
chain.finalize();
ExpressionActionsPtr expression = chain.getLastActions();
StoragePtr table = StorageSystemNumbers::create("Numbers");
Names column_names;
column_names.push_back("number");
QueryProcessingStage::Enum stage;
BlockInputStreamPtr in = table->read(column_names, 0, context, stage)[0];
ForkBlockInputStreams fork(in);
BlockInputStreamPtr in1 = fork.createInput();
BlockInputStreamPtr in2 = fork.createInput();
in1 = std::make_shared<FilterBlockInputStream>(in1, expression, 1);
in1 = std::make_shared<LimitBlockInputStream>(in1, 10, 0);
in2 = std::make_shared<FilterBlockInputStream>(in2, expression, 1);
in2 = std::make_shared<LimitBlockInputStream>(in2, 20, 5);
Block out_sample = expression->getSampleBlock();
WriteBufferFromOStream ob1(std::cout);
WriteBufferFromOStream ob2(std::cerr);
BlockOutputStreamPtr out1 = context.getOutputFormat("TabSeparated", ob1, out_sample);
BlockOutputStreamPtr out2 = context.getOutputFormat("TabSeparated", ob2, out_sample);
std::thread thr1(std::bind(thread1, in1, out1, std::ref(ob1)));
std::thread thr2(std::bind(thread2, in2, out2, std::ref(ob2)));
fork.run();
thr1.join();
thr2.join();
return 0;
}
catch (const DB::Exception & e)
{
std::cerr << e.what() << ", " << e.displayText() << std::endl;
throw;
}