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55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
#pragma once
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#include "config_formats.h"
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#if USE_PROTOBUF
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# include <Core/Block.h>
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# include <Formats/FormatSchemaInfo.h>
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# include <Formats/FormatSettings.h>
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# include <Processors/Formats/IRowOutputFormat.h>
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namespace DB
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{
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class ProtobufWriter;
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class ProtobufSerializer;
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class FormatSchemaInfo;
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struct FormatSettings;
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/** Stream designed to serialize data in the google protobuf format.
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* Each row is written as a separated message.
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*
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* With use_length_delimiters=0 it can write only single row as plain protobuf message,
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* otherwise Protobuf messages are delimited according to documentation
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* https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/util/delimited_message_util.h
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* Serializing in the protobuf format requires the 'format_schema' setting to be set, e.g.
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* SELECT * from table FORMAT Protobuf SETTINGS format_schema = 'schema:Message'
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* where schema is the name of "schema.proto" file specifying protobuf schema.
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*/
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class ProtobufRowOutputFormat : public IRowOutputFormat
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{
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public:
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ProtobufRowOutputFormat(
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WriteBuffer & out_,
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const Block & header_,
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const RowOutputFormatParams & params_,
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const FormatSchemaInfo & schema_info_,
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const FormatSettings & settings_,
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bool with_length_delimiter_);
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String getName() const override { return "ProtobufRowOutputFormat"; }
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std::string getContentType() const override { return "application/octet-stream"; }
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private:
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void write(const Columns & columns, size_t row_num) override;
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void writeField(const IColumn &, const ISerialization &, size_t) override {}
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std::unique_ptr<ProtobufWriter> writer;
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std::unique_ptr<ProtobufSerializer> serializer;
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const bool allow_multiple_rows;
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};
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}
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#endif
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