ClickHouse/dbms/src/Storages/StorageSystemEvents.cpp
2014-01-03 08:20:13 +00:00

63 lines
1.5 KiB
C++

#include <DB/Common/ProfileEvents.h>
#include <DB/Columns/ColumnString.h>
#include <DB/DataTypes/DataTypeString.h>
#include <DB/DataTypes/DataTypesNumberFixed.h>
#include <DB/DataStreams/OneBlockInputStream.h>
#include <DB/Storages/StorageSystemEvents.h>
namespace DB
{
StorageSystemEvents::StorageSystemEvents(const std::string & name_)
: name(name_)
{
columns.push_back(NameAndTypePair("event", new DataTypeString));
columns.push_back(NameAndTypePair("value", new DataTypeUInt64));
}
StoragePtr StorageSystemEvents::create(const std::string & name_)
{
return (new StorageSystemEvents(name_))->thisPtr();
}
BlockInputStreams StorageSystemEvents::read(
const Names & column_names, ASTPtr query, const Settings & settings,
QueryProcessingStage::Enum & processed_stage, size_t max_block_size, unsigned threads)
{
check(column_names);
processed_stage = QueryProcessingStage::FetchColumns;
Block block;
ColumnWithNameAndType col_event;
col_event.name = "event";
col_event.type = new DataTypeString;
col_event.column = new ColumnString;
block.insert(col_event);
ColumnWithNameAndType col_value;
col_value.name = "value";
col_value.type = new DataTypeUInt64;
col_value.column = new ColumnUInt64;
block.insert(col_value);
for (size_t i = 0; i < ProfileEvents::END; ++i)
{
UInt64 value = ProfileEvents::counters[i];
if (0 != value)
{
col_event.column->insert(String(ProfileEvents::getDescription(ProfileEvents::Event(i))));
col_value.column->insert(value);
}
}
return BlockInputStreams(1, new OneBlockInputStream(block));
}
}