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#include <Formats/NativeReader.h>
#include <Formats/NativeWriter.h>
#include <Formats/FormatFactory.h>
#include <Processors/Formats/IInputFormat.h>
#include <Processors/Formats/IOutputFormat.h>
#include <Processors/Formats/ISchemaReader.h>
#include <Processors/Transforms/AggregatingTransform.h>
namespace DB
{
class NativeInputFormat final : public IInputFormat
{
public:
NativeInputFormat(ReadBuffer & buf, const Block & header_, const FormatSettings & settings)
: IInputFormat(header_, &buf)
, reader(std::make_unique<NativeReader>(
buf,
header_,
0,
settings.skip_unknown_fields,
settings.null_as_default,
settings.native.allow_types_conversion,
settings.defaults_for_omitted_fields ? &block_missing_values : nullptr))
, header(header_) {}
String getName() const override { return "Native"; }
void resetParser() override
{
IInputFormat::resetParser();
reader->resetParser();
}
Chunk generate() override
{
block_missing_values.clear();
size_t block_start = getDataOffsetMaybeCompressed(*in);
auto block = reader->read();
approx_bytes_read_for_chunk = getDataOffsetMaybeCompressed(*in) - block_start;
if (!block)
return {};
assertBlocksHaveEqualStructure(getPort().getHeader(), block, getName());
block.checkNumberOfRows();
size_t num_rows = block.rows();
return Chunk(block.getColumns(), num_rows);
}
void setReadBuffer(ReadBuffer & in_) override
{
reader = std::make_unique<NativeReader>(in_, header, 0);
IInputFormat::setReadBuffer(in_);
}
const BlockMissingValues & getMissingValues() const override { return block_missing_values; }
size_t getApproxBytesReadForChunk() const override { return approx_bytes_read_for_chunk; }
private:
std::unique_ptr<NativeReader> reader;
Block header;
BlockMissingValues block_missing_values;
size_t approx_bytes_read_for_chunk = 0;
};
class NativeOutputFormat final : public IOutputFormat
{
public:
NativeOutputFormat(WriteBuffer & buf, const Block & header, UInt64 client_protocol_version = 0)
: IOutputFormat(header, buf)
, writer(buf, client_protocol_version, header)
{
}
String getName() const override { return "Native"; }
std::string getContentType() const override
{
return writer.getContentType();
}
protected:
void consume(Chunk chunk) override
{
if (chunk)
{
auto block = getPort(PortKind::Main).getHeader();
block.setColumns(chunk.detachColumns());
writer.write(block);
}
}
private:
NativeWriter writer;
};
class NativeSchemaReader : public ISchemaReader
{
public:
explicit NativeSchemaReader(ReadBuffer & in_) : ISchemaReader(in_) {}
NamesAndTypesList readSchema() override
{
auto reader = NativeReader(in, 0);
auto block = reader.read();
return block.getNamesAndTypesList();
}
};
void registerInputFormatNative(FormatFactory & factory)
{
factory.registerInputFormat("Native", [](
ReadBuffer & buf,
const Block & sample,
const RowInputFormatParams &,
const FormatSettings & settings)
{
return std::make_shared<NativeInputFormat>(buf, sample, settings);
});
factory.markFormatSupportsSubsetOfColumns("Native");
}
void registerOutputFormatNative(FormatFactory & factory)
{
factory.registerOutputFormat("Native", [](
WriteBuffer & buf,
const Block & sample,
const FormatSettings & settings)
{
return std::make_shared<NativeOutputFormat>(buf, sample, settings.client_protocol_version);
});
}
void registerNativeSchemaReader(FormatFactory & factory)
{
factory.registerSchemaReader("Native", [](ReadBuffer & buf, const FormatSettings &)
{
return std::make_shared<NativeSchemaReader>(buf);
});
}
}
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