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#include <Processors/Formats/IOutputFormat.h>
#include <IO/WriteBuffer.h>
namespace DB
{
IOutputFormat::IOutputFormat(const Block & header_, WriteBuffer & out_)
: IProcessor({header_, header_, header_}, {}), out(out_)
{
}
IOutputFormat::Status IOutputFormat::prepare()
{
if (has_input)
return Status::Ready;
for (auto kind : {Main, Totals, Extremes})
{
auto & input = getPort(kind);
if (kind != Main && !input.isConnected())
continue;
if (input.isFinished())
continue;
input.setNeeded();
if (!input.hasData())
return Status::NeedData;
current_chunk = input.pull(true);
current_block_kind = kind;
has_input = true;
return Status::Ready;
}
finished = true;
if (!finalized)
return Status::Ready;
return Status::Finished;
}
static Chunk prepareTotals(Chunk chunk)
{
if (!chunk.hasRows())
return {};
if (chunk.getNumRows() > 1)
{
/// This may happen if something like ARRAY JOIN was executed on totals.
/// Skip rows except the first one.
auto columns = chunk.detachColumns();
for (auto & column : columns)
column = column->cut(0, 1);
chunk.setColumns(std::move(columns), 1);
}
return chunk;
}
void IOutputFormat::work()
{
writePrefixIfNeeded();
if (finished && !finalized)
{
if (rows_before_limit_counter && rows_before_limit_counter->hasAppliedLimit())
setRowsBeforeLimit(rows_before_limit_counter->get());
finalize();
if (auto_flush)
flush();
return;
}
switch (current_block_kind)
{
case Main:
result_rows += current_chunk.getNumRows();
result_bytes += current_chunk.allocatedBytes();
consume(std::move(current_chunk));
break;
case Totals:
writeSuffixIfNeeded();
if (auto totals = prepareTotals(std::move(current_chunk)))
{
consumeTotals(std::move(totals));
are_totals_written = true;
}
break;
case Extremes:
writeSuffixIfNeeded();
consumeExtremes(std::move(current_chunk));
break;
}
if (auto_flush)
flush();
has_input = false;
}
void IOutputFormat::flush()
{
out.next();
}
void IOutputFormat::write(const Block & block)
{
writePrefixIfNeeded();
consume(Chunk(block.getColumns(), block.rows()));
if (auto_flush)
flush();
}
void IOutputFormat::finalize()
{
if (finalized)
return;
writePrefixIfNeeded();
writeSuffixIfNeeded();
finalizeImpl();
finalizeBuffers();
finalized = true;
}
}
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