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#pragma once
#include <Core/Block.h>
#include <Processors/Formats/OutputFormatWithUTF8ValidationAdaptor.h>
#include <Formats/FormatSettings.h>
#include <IO/WriteBuffer.h>
namespace DB
{
class WriteBuffer;
/// Base class for Columnar JSON output formats.
/// It buffers all data and outputs it as a single block in writeSuffix() method.
class JSONColumnsBlockOutputFormatBase : public OutputFormatWithUTF8ValidationAdaptor
{
public:
JSONColumnsBlockOutputFormatBase(WriteBuffer & out_, const Block & header_, const FormatSettings & format_settings_, bool validate_utf8);
String getName() const override { return "JSONColumnsBlockOutputFormatBase"; }
protected:
void consume(Chunk chunk) override;
void writeSuffix() override;
void writeChunk(Chunk & chunk);
void writeColumn(const IColumn & column, const ISerialization & serialization);
virtual void writeChunkStart() = 0;
virtual void writeChunkEnd() = 0;
virtual void writeColumnStart(size_t /*column_index*/) = 0;
void writeColumnEnd(bool is_last);
const FormatSettings format_settings;
const Serializations serializations;
Chunk mono_chunk;
size_t written_rows = 0;
};
}
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