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#include <variant>
#include <Processors/Sources/RemoteSource.h>
#include <QueryPipeline/RemoteQueryExecutor.h>
#include <QueryPipeline/RemoteQueryExecutorReadContext.h>
#include <QueryPipeline/StreamLocalLimits.h>
#include <Processors/Transforms/AggregatingTransform.h>
#include <DataTypes/DataTypeAggregateFunction.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
RemoteSource::RemoteSource(RemoteQueryExecutorPtr executor, bool add_aggregation_info_, bool async_read_, bool async_query_sending_)
: ISource(executor->getHeader(), false)
, add_aggregation_info(add_aggregation_info_), query_executor(std::move(executor))
, async_read(async_read_)
, async_query_sending(async_query_sending_)
{
/// Add AggregatedChunkInfo if we expect DataTypeAggregateFunction as a result.
const auto & sample = getPort().getHeader();
for (auto & type : sample.getDataTypes())
if (typeid_cast<const DataTypeAggregateFunction *>(type.get()))
add_aggregation_info = true;
}
RemoteSource::~RemoteSource() = default;
void RemoteSource::setStorageLimits(const std::shared_ptr<const StorageLimitsList> & storage_limits_)
{
/// Remove leaf limits for remote source.
StorageLimitsList list;
for (const auto & value : *storage_limits_)
list.emplace_back(StorageLimits{value.local_limits, {}});
storage_limits = std::make_shared<const StorageLimitsList>(std::move(list));
}
ISource::Status RemoteSource::prepare()
{
/// Check if query was cancelled before returning Async status. Otherwise it may lead to infinite loop.
if (was_query_canceled)
{
getPort().finish();
return Status::Finished;
}
if (is_async_state)
return Status::Async;
Status status = ISource::prepare();
/// To avoid resetting the connection (because of "unfinished" query) in the
/// RemoteQueryExecutor it should be finished explicitly.
if (status == Status::Finished)
{
query_executor->finish();
is_async_state = false;
return status;
}
return status;
}
std::optional<Chunk> RemoteSource::tryGenerate()
{
/// onCancel() will do the cancel if the query was sent.
if (was_query_canceled)
return {};
if (!was_query_sent)
{
/// Progress method will be called on Progress packet.
query_executor->setProgressCallback([this](const Progress & value)
{
if (value.total_rows_to_read)
addTotalRowsApprox(value.total_rows_to_read);
if (value.total_bytes_to_read)
addTotalBytes(value.total_bytes_to_read);
progress(value.read_rows, value.read_bytes);
});
/// Get rows_before_limit result for remote query from ProfileInfo packet.
query_executor->setProfileInfoCallback([this](const ProfileInfo & info)
{
if (rows_before_limit)
{
if (info.hasAppliedLimit())
rows_before_limit->add(info.getRowsBeforeLimit());
else
manually_add_rows_before_limit_counter = true; /// Remote subquery doesn't contain a limit
}
});
if (async_query_sending)
{
int fd_ = query_executor->sendQueryAsync();
if (fd_ >= 0)
{
fd = fd_;
is_async_state = true;
return Chunk();
}
is_async_state = false;
}
else
{
query_executor->sendQuery();
}
was_query_sent = true;
}
Block block;
if (async_read)
{
auto res = query_executor->readAsync();
if (res.getType() == RemoteQueryExecutor::ReadResult::Type::Nothing)
throw Exception(ErrorCodes::LOGICAL_ERROR, "Got an empty packet from the RemoteQueryExecutor. This is a bug");
if (res.getType() == RemoteQueryExecutor::ReadResult::Type::FileDescriptor)
{
fd = res.getFileDescriptor();
is_async_state = true;
return Chunk();
}
if (res.getType() == RemoteQueryExecutor::ReadResult::Type::ParallelReplicasToken)
{
is_async_state = false;
return Chunk();
}
is_async_state = false;
block = res.getBlock();
}
else
block = query_executor->readBlock();
if (!block)
{
if (manually_add_rows_before_limit_counter)
rows_before_limit->add(rows);
query_executor->finish();
return {};
}
UInt64 num_rows = block.rows();
rows += num_rows;
Chunk chunk(block.getColumns(), num_rows);
if (add_aggregation_info)
{
auto info = std::make_shared<AggregatedChunkInfo>();
info->bucket_num = block.info.bucket_num;
info->is_overflows = block.info.is_overflows;
chunk.setChunkInfo(std::move(info));
}
return chunk;
}
void RemoteSource::onCancel()
{
was_query_canceled = true;
query_executor->cancel();
}
void RemoteSource::onUpdatePorts()
{
if (getPort().isFinished())
{
was_query_canceled = true;
query_executor->finish();
}
}
RemoteTotalsSource::RemoteTotalsSource(RemoteQueryExecutorPtr executor)
: ISource(executor->getHeader())
, query_executor(std::move(executor))
{
}
RemoteTotalsSource::~RemoteTotalsSource() = default;
Chunk RemoteTotalsSource::generate()
{
if (auto block = query_executor->getTotals())
{
UInt64 num_rows = block.rows();
return Chunk(block.getColumns(), num_rows);
}
return {};
}
RemoteExtremesSource::RemoteExtremesSource(RemoteQueryExecutorPtr executor)
: ISource(executor->getHeader())
, query_executor(std::move(executor))
{
}
RemoteExtremesSource::~RemoteExtremesSource() = default;
Chunk RemoteExtremesSource::generate()
{
if (auto block = query_executor->getExtremes())
{
UInt64 num_rows = block.rows();
return Chunk(block.getColumns(), num_rows);
}
return {};
}
Pipe createRemoteSourcePipe(
RemoteQueryExecutorPtr query_executor,
bool add_aggregation_info, bool add_totals, bool add_extremes, bool async_read, bool async_query_sending)
{
Pipe pipe(std::make_shared<RemoteSource>(query_executor, add_aggregation_info, async_read, async_query_sending));
if (add_totals)
pipe.addTotalsSource(std::make_shared<RemoteTotalsSource>(query_executor));
if (add_extremes)
pipe.addExtremesSource(std::make_shared<RemoteExtremesSource>(query_executor));
return pipe;
}
}
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