mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-24 18:50:49 +00:00
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
#pragma once
|
||
|
||
#include <Processors/ISource.h>
|
||
|
||
|
||
namespace DB
|
||
{
|
||
|
||
class ReadBuffer;
|
||
|
||
/** Input format is a source, that reads data from ReadBuffer.
|
||
*/
|
||
class IInputFormat : public ISource
|
||
{
|
||
protected:
|
||
|
||
/// Skip GCC warning: ‘maybe_unused’ attribute ignored
|
||
#pragma GCC diagnostic push
|
||
#pragma GCC diagnostic ignored "-Wattributes"
|
||
|
||
ReadBuffer & in [[maybe_unused]];
|
||
|
||
#pragma GCC diagnostic pop
|
||
|
||
public:
|
||
IInputFormat(Block header, ReadBuffer & in_);
|
||
|
||
/** In some usecase (hello Kafka) we need to read a lot of tiny streams in exactly the same format.
|
||
* The recreating of parser for each small stream takes too long, so we introduce a method
|
||
* resetParser() which allow to reset the state of parser to continue reading of
|
||
* source stream w/o recreating that.
|
||
* That should be called after current buffer was fully read.
|
||
*/
|
||
virtual void resetParser();
|
||
|
||
virtual const BlockMissingValues & getMissingValues() const
|
||
{
|
||
static const BlockMissingValues none;
|
||
return none;
|
||
}
|
||
|
||
size_t getCurrentUnitNumber() const { return current_unit_number; }
|
||
void setCurrentUnitNumber(size_t current_unit_number_) { current_unit_number = current_unit_number_; }
|
||
|
||
private:
|
||
/// Number of currently parsed chunk (if parallel parsing is enabled)
|
||
size_t current_unit_number = 0;
|
||
};
|
||
|
||
}
|