ClickHouse/dbms/include/DB/DataStreams/SquashingBlockInputStream.h

#pragma once

#include <DB/DataStreams/IProfilingBlockInputStream.h>
#include <DB/DataStreams/SquashingTransform.h>


namespace DB
{

/** Merging consecutive blocks of stream to specified minimum size.
  */
class SquashingBlockInputStream : public IProfilingBlockInputStream
{
public:
	SquashingBlockInputStream(BlockInputStreamPtr & src, size_t min_block_size_rows, size_t min_block_size_bytes);

	String getName() const override { return "Squashing"; }

	String getID() const override
	{
		std::stringstream res;
		res << "Squashing(" << children.at(0)->getID() << ")";
		return res.str();
	}

protected:
	Block readImpl() override;

private:
	SquashingTransform transform;
	bool all_read = false;
};

}