mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-14 18:32:29 +00:00
115 lines
3.8 KiB
C++
115 lines
3.8 KiB
C++
#include <DataStreams/ColumnGathererStream.h>
|
|
#include <common/logger_useful.h>
|
|
#include <Common/typeid_cast.h>
|
|
#include <Common/formatReadable.h>
|
|
#include <IO/WriteHelpers.h>
|
|
#include <iomanip>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
namespace ErrorCodes
|
|
{
|
|
extern const int INCOMPATIBLE_COLUMNS;
|
|
extern const int INCORRECT_NUMBER_OF_COLUMNS;
|
|
extern const int EMPTY_DATA_PASSED;
|
|
extern const int RECEIVED_EMPTY_DATA;
|
|
}
|
|
|
|
ColumnGathererStream::ColumnGathererStream(
|
|
const String & column_name_, const BlockInputStreams & source_streams, ReadBuffer & row_sources_buf_,
|
|
size_t block_preferred_size_)
|
|
: column_name(column_name_), sources(source_streams.size()), row_sources_buf(row_sources_buf_)
|
|
, block_preferred_size(block_preferred_size_), log(&Poco::Logger::get("ColumnGathererStream"))
|
|
{
|
|
if (source_streams.empty())
|
|
throw Exception("There are no streams to gather", ErrorCodes::EMPTY_DATA_PASSED);
|
|
|
|
children.assign(source_streams.begin(), source_streams.end());
|
|
|
|
for (size_t i = 0; i < children.size(); ++i)
|
|
{
|
|
const Block & header = children[i]->getHeader();
|
|
|
|
/// Sometimes MergeTreeReader injects additional column with partitioning key
|
|
if (header.columns() > 2)
|
|
throw Exception(
|
|
"Block should have 1 or 2 columns, but contains " + toString(header.columns()),
|
|
ErrorCodes::INCORRECT_NUMBER_OF_COLUMNS);
|
|
|
|
if (i == 0)
|
|
{
|
|
column.name = column_name;
|
|
column.type = header.getByName(column_name).type;
|
|
column.column = column.type->createColumn();
|
|
}
|
|
else if (header.getByName(column_name).column->getName() != column.column->getName())
|
|
throw Exception("Column types don't match", ErrorCodes::INCOMPATIBLE_COLUMNS);
|
|
}
|
|
}
|
|
|
|
|
|
Block ColumnGathererStream::readImpl()
|
|
{
|
|
/// Special case: single source and there are no skipped rows
|
|
if (children.size() == 1 && row_sources_buf.eof() && !source_to_fully_copy)
|
|
return children[0]->read();
|
|
|
|
if (!source_to_fully_copy && row_sources_buf.eof())
|
|
return Block();
|
|
|
|
MutableColumnPtr output_column = column.column->cloneEmpty();
|
|
output_block = Block{column.cloneEmpty()};
|
|
/// Surprisingly this call may directly change output_block, bypassing
|
|
/// output_column. See ColumnGathererStream::gather.
|
|
output_column->gather(*this);
|
|
if (!output_column->empty())
|
|
output_block.getByPosition(0).column = std::move(output_column);
|
|
|
|
return output_block;
|
|
}
|
|
|
|
|
|
void ColumnGathererStream::fetchNewBlock(Source & source, size_t source_num)
|
|
{
|
|
try
|
|
{
|
|
source.block = children[source_num]->read();
|
|
source.update(column_name);
|
|
}
|
|
catch (Exception & e)
|
|
{
|
|
e.addMessage("Cannot fetch required block. Stream " + children[source_num]->getName() + ", part " + toString(source_num));
|
|
throw;
|
|
}
|
|
|
|
if (0 == source.size)
|
|
{
|
|
throw Exception("Fetched block is empty. Stream " + children[source_num]->getName() + ", part " + toString(source_num),
|
|
ErrorCodes::RECEIVED_EMPTY_DATA);
|
|
}
|
|
}
|
|
|
|
|
|
void ColumnGathererStream::readSuffixImpl()
|
|
{
|
|
const BlockStreamProfileInfo & profile_info = getProfileInfo();
|
|
|
|
/// Don't print info for small parts (< 10M rows)
|
|
if (profile_info.rows < 10000000)
|
|
return;
|
|
|
|
double seconds = profile_info.total_stopwatch.elapsedSeconds();
|
|
|
|
if (!seconds)
|
|
LOG_DEBUG(log, "Gathered column {} ({} bytes/elem.) in 0 sec.",
|
|
column_name, static_cast<double>(profile_info.bytes) / profile_info.rows);
|
|
else
|
|
LOG_DEBUG(log, "Gathered column {} ({} bytes/elem.) in {} sec., {} rows/sec., {}/sec.",
|
|
column_name, static_cast<double>(profile_info.bytes) / profile_info.rows, seconds,
|
|
profile_info.rows / seconds, ReadableSize(profile_info.bytes / seconds));
|
|
}
|
|
|
|
}
|