ClickHouse/src/Processors/Formats/Impl/TabSeparatedRawRowInputFormat.h

#pragma once

#include <Core/Block.h>
#include <Formats/FormatSettings.h>
#include <IO/ReadBufferFromString.h>
#include <Processors/Formats/RowInputFormatWithDiagnosticInfo.h>


namespace DB
{

/** A stream to input data in tsv format, but without escaping individual values.
  * It only supports columns without '\n' or '\t'
  */
class TabSeparatedRawRowInputFormat : public TabSeparatedRowInputFormat
{
public:
    /** with_names - the first line is the header with the names of the columns
      * with_types - on the next line header with type names
      */
    TabSeparatedRawRowInputFormat(
        const Block & header_,
        ReadBuffer & in_,
        const Params & params_,
        bool with_names_,
        bool with_types_,
        const FormatSettings & format_settings_)
        : TabSeparatedRowInputFormat(header_, in_, params_, with_names_, with_types_, format_settings_)
    {
    }

    String getName() const override { return "TabSeparatedRawRowInputFormat"; }

    bool readField(IColumn & column, const DataTypePtr &, const SerializationPtr & serialization, bool) override
    {
        String tmp;

        while (!in->eof())
        {
            char * pos = find_first_symbols<'\n', '\t'>(in->position(), in->buffer().end());

            tmp.append(in->position(), pos - in->position());
            in->position() = pos;

            if (pos == in->buffer().end())
                in->next();
            else
                break;
        }

        ReadBufferFromString cell(tmp);
        serialization->deserializeWholeText(column, cell, format_settings);

        return true;
    }
};

}