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49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
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#pragma once
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#include <Core/Block.h>
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#include <Formats/FormatSettings.h>
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#include <Processors/Formats/Impl/ProtobufWriter.h>
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#include <Processors/Formats/IOutputFormat.h>
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namespace google
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{
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namespace protobuf
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{
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class Message;
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}
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}
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namespace DB
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{
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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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* These 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 ProtobufBlockOutputFormat : public IOutputFormat
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{
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public:
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ProtobufBlockOutputFormat(
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WriteBuffer & out,
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Block header,
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const google::protobuf::Descriptor * message_prototype,
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const FormatSettings & format_settings);
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String getName() const override { return "ProtobufBlockOutputFormat"; }
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void consume(Chunk chunk) override;
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std::string getContentType() const override { return "application/octet-stream"; }
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private:
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ProtobufWriter writer;
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const Block header;
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const FormatSettings format_settings;
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};
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}
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