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44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
#pragma once
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#include <boost/noncopyable.hpp>
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#include <memory>
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#include <string>
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#include <Columns/IColumn.h>
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namespace DB
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{
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/** Interface of stream, that allows to read data by rows.
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*/
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class IRowInputStream : private boost::noncopyable
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{
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public:
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/** Read next row and append it to the columns.
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* If no more rows - return false.
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*/
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virtual bool read(MutableColumns & columns) = 0;
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virtual void readPrefix() {}; /// delimiter before begin of result
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virtual void readSuffix() {}; /// delimiter after end of result
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/// Skip data until next row.
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/// This is intended for text streams, that allow skipping of errors.
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/// By default - throws not implemented exception.
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virtual bool allowSyncAfterError() const { return false; }
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virtual void syncAfterError();
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/// In case of parse error, try to roll back and parse last one or two rows very carefully
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/// and collect as much as possible diagnostic information about error.
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/// If not implemented, returns empty string.
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virtual std::string getDiagnosticInfo() { return {}; };
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virtual ~IRowInputStream() {}
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};
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using RowInputStreamPtr = std::shared_ptr<IRowInputStream>;
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}
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