ClickHouse/src/DataStreams/InputStreamFromASTInsertQuery.h
2020-06-18 14:02:31 +03:00

47 lines
1.3 KiB
C++

#pragma once
#include <Parsers/IAST.h>
#include <DataStreams/IBlockInputStream.h>
#include <cstddef>
#include <memory>
namespace DB
{
struct BlockIO;
class Context;
struct StorageInMemoryMetadata;
using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
/** Prepares an input stream which produce data containing in INSERT query
* Head of inserting data could be stored in INSERT ast directly
* Remaining (tail) data could be stored in input_buffer_tail_part
*/
class InputStreamFromASTInsertQuery : public IBlockInputStream
{
public:
InputStreamFromASTInsertQuery(
const ASTPtr & ast,
ReadBuffer * input_buffer_tail_part,
const Block & header,
const Context & context,
const ASTPtr & input_function);
Block readImpl() override { return res_stream->read(); }
void readPrefixImpl() override { return res_stream->readPrefix(); }
void readSuffixImpl() override { return res_stream->readSuffix(); }
String getName() const override { return "InputStreamFromASTInsertQuery"; }
Block getHeader() const override { return res_stream->getHeader(); }
private:
std::unique_ptr<ReadBuffer> input_buffer_ast_part;
std::unique_ptr<ReadBuffer> input_buffer_contacenated;
BlockInputStreamPtr res_stream;
};
}