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55 lines
1.3 KiB
C++
55 lines
1.3 KiB
C++
#pragma once
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#include <string>
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#include <Processors/IProcessor.h>
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namespace DB
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{
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class WriteBuffer;
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/** Output format have three inputs and no outputs. It writes data from WriteBuffer.
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*
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* First input is for main resultset, second is for "totals" and third is for "extremes".
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* It's not necessarily to connect "totals" or "extremes" ports (they may remain dangling).
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*
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* Data from input ports are pulled in order: first, from main input, then totals, then extremes.
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*
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* By default, data for "totals" and "extremes" is ignored.
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*/
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class IOutputFormat : public IProcessor
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{
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public:
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enum PortKind { Main = 0, Totals = 1, Extremes = 2 };
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protected:
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WriteBuffer & out;
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Block current_block;
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PortKind current_block_kind;
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bool has_input = false;
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virtual void consume(Block) = 0;
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virtual void consumeTotals(Block) {}
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virtual void consumeExtremes(Block) {}
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public:
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IOutputFormat(Block header, WriteBuffer & out);
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Status prepare() override;
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void work() override;
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void flush();
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/** Content-Type to set when sending HTTP response.
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*/
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virtual std::string getContentType() const { return "text/plain; charset=UTF-8"; }
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/// TODO onProgress, rows_before_limit_at_least
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InputPort & getPort(PortKind kind) { return inputs[kind]; }
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};
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}
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