mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-26 09:32:01 +00:00
97f2a2213e
* Move some code outside dbms/src folder * Fix paths
47 lines
1.0 KiB
C++
47 lines
1.0 KiB
C++
#pragma once
|
|
#include <Processors/IProcessor.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
/// Transform which can generate several chunks on every consumed.
|
|
/// It can be assumed that class is used in following way:
|
|
///
|
|
/// for (chunk : input_chunks)
|
|
/// {
|
|
/// transform.consume(chunk);
|
|
///
|
|
/// while (transform.canGenerate())
|
|
/// {
|
|
/// transformed_chunk = transform.generate();
|
|
/// ... (process transformed chunk)
|
|
/// }
|
|
/// }
|
|
///
|
|
class IInflatingTransform : public IProcessor
|
|
{
|
|
protected:
|
|
InputPort & input;
|
|
OutputPort & output;
|
|
|
|
Chunk current_chunk;
|
|
bool has_input = false;
|
|
bool generated = false;
|
|
bool can_generate = false;
|
|
|
|
virtual void consume(Chunk chunk) = 0;
|
|
virtual bool canGenerate() = 0;
|
|
virtual Chunk generate() = 0;
|
|
|
|
public:
|
|
IInflatingTransform(Block input_header, Block output_header);
|
|
|
|
Status prepare() override;
|
|
void work() override;
|
|
|
|
InputPort & getInputPort() { return input; }
|
|
OutputPort & getOutputPort() { return output; }
|
|
};
|
|
|
|
}
|