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#include <cmath>
#include <IO/WriteHelpers.h>
#include <IO/WriteBufferFromString.h>
#include <Processors/Formats/Impl/VerticalRowOutputFormat.h>
#include <Formats/FormatFactory.h>
#include <Common/UTF8Helpers.h>
namespace DB
{
VerticalRowOutputFormat::VerticalRowOutputFormat(
WriteBuffer & out_, const Block & header_, const FormatSettings & format_settings_)
: IRowOutputFormat(header_, out_), format_settings(format_settings_)
{
const auto & sample = getPort(PortKind::Main).getHeader();
size_t columns = sample.columns();
using Widths = std::vector<size_t>;
Widths name_widths(columns);
size_t max_name_width = 0;
String serialized_value;
for (size_t i = 0; i < columns; ++i)
{
/// Note that number of code points is just a rough approximation of visible string width.
const String & name = sample.getByPosition(i).name;
name_widths[i] = UTF8::computeWidth(reinterpret_cast<const UInt8 *>(name.data()), name.size());
if (name_widths[i] > max_name_width)
max_name_width = name_widths[i];
}
names_and_paddings.resize(columns);
for (size_t i = 0; i < columns; ++i)
{
WriteBufferFromString buf(names_and_paddings[i]);
writeString(sample.getByPosition(i).name, buf);
writeCString(": ", buf);
}
for (size_t i = 0; i < columns; ++i)
{
size_t new_size = max_name_width - name_widths[i] + names_and_paddings[i].size();
names_and_paddings[i].resize(new_size, ' ');
}
}
void VerticalRowOutputFormat::writeField(const IColumn & column, const ISerialization & serialization, size_t row_num)
{
if (row_number > format_settings.pretty.max_rows)
return;
writeString(names_and_paddings[field_number], out);
writeValue(column, serialization, row_num);
writeChar('\n', out);
++field_number;
}
void VerticalRowOutputFormat::writeValue(const IColumn & column, const ISerialization & serialization, size_t row_num) const
{
serialization.serializeText(column, row_num, out, format_settings);
}
void VerticalRowOutputFormat::writeRowStartDelimiter()
{
field_number = 0;
++row_number;
if (row_number > format_settings.pretty.max_rows)
return;
writeCString("Row ", out);
writeIntText(row_number, out);
writeCString(":\n", out);
size_t width = static_cast<size_t>(log10(row_number + 1)) + 1 + strlen("Row :");
for (size_t i = 0; i < width; ++i)
writeCString("─", out);
writeChar('\n', out);
}
void VerticalRowOutputFormat::writeRowBetweenDelimiter()
{
if (row_number > format_settings.pretty.max_rows)
return;
writeChar('\n', out);
}
void VerticalRowOutputFormat::writeSuffix()
{
if (row_number > format_settings.pretty.max_rows)
{
writeCString("Showed first ", out);
writeIntText(format_settings.pretty.max_rows, out);
writeCString(".\n", out);
}
}
void VerticalRowOutputFormat::writeBeforeTotals()
{
writeCString("\n", out);
writeCString("\n", out);
}
void VerticalRowOutputFormat::writeBeforeExtremes()
{
if (!areTotalsWritten())
writeCString("\n", out);
writeCString("\n", out);
}
void VerticalRowOutputFormat::writeMinExtreme(const Columns & columns, size_t row_num)
{
writeSpecialRow(columns, row_num, "Min");
}
void VerticalRowOutputFormat::writeMaxExtreme(const Columns & columns, size_t row_num)
{
writeSpecialRow(columns, row_num, "Max");
}
void VerticalRowOutputFormat::writeTotals(const Columns & columns, size_t row_num)
{
writeSpecialRow(columns, row_num, "Totals");
}
void VerticalRowOutputFormat::writeSpecialRow(const Columns & columns, size_t row_num, const char * title)
{
row_number = 0;
field_number = 0;
size_t columns_size = columns.size();
writeCString(title, out);
writeCString(":\n", out);
size_t width = strlen(title) + 1;
for (size_t i = 0; i < width; ++i)
writeCString("─", out);
writeChar('\n', out);
for (size_t i = 0; i < columns_size; ++i)
writeField(*columns[i], *serializations[i], row_num);
}
void registerOutputFormatVertical(FormatFactory & factory)
{
factory.registerOutputFormat("Vertical", [](
WriteBuffer & buf,
const Block & sample,
const FormatSettings & settings)
{
return std::make_shared<VerticalRowOutputFormat>(buf, sample, settings);
});
factory.markOutputFormatSupportsParallelFormatting("Vertical");
}
}
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