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#pragma once
#include <Core/Block.h>
#include <Formats/FormatSettings.h>
#include <Processors/Formats/IRowOutputFormat.h>
namespace DB
{
class WriteBuffer;
class Context;
/** Stream to output data in format "each value in separate row".
* Usable to show few rows with many columns.
*/
class VerticalRowOutputFormat final : public IRowOutputFormat
{
public:
VerticalRowOutputFormat(WriteBuffer & out_, const Block & header_, const FormatSettings & format_settings_);
String getName() const override { return "VerticalRowOutputFormat"; }
private:
void writeField(const IColumn & column, const ISerialization & serialization, size_t row_num) override;
void writeRowStartDelimiter() override;
void writeRowBetweenDelimiter() override;
void writeSuffix() override;
void writeMinExtreme(const Columns & columns, size_t row_num) override;
void writeMaxExtreme(const Columns & columns, size_t row_num) override;
void writeTotals(const Columns & columns, size_t row_num) override;
bool supportTotals() const override { return true; }
bool supportExtremes() const override { return true; }
void writeBeforeTotals() override;
void writeBeforeExtremes() override;
void writeValue(const IColumn & column, const ISerialization & serialization, size_t row_num) const;
void onRowsReadBeforeUpdate() override { row_number = getRowsReadBefore(); }
/// For totals and extremes.
void writeSpecialRow(const Columns & columns, size_t row_num, const char * title);
void resetFormatterImpl() override
{
row_number = 0;
}
const FormatSettings format_settings;
size_t field_number = 0;
size_t row_number = 0;
using NamesAndPaddings = std::vector<String>;
NamesAndPaddings names_and_paddings;
};
}
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