ClickHouse/dbms/src/DataStreams/InputStreamFromASTInsertQuery.h

#pragma once

#include <Parsers/ASTInsertQuery.h>
#include <Interpreters/Context.h>
#include <IO/ConcatReadBuffer.h>
#include <DataStreams/IProfilingBlockInputStream.h>
#include <DataStreams/BlockIO.h>
#include <cstddef>


namespace DB
{

namespace ErrorCodes
{
    extern const int LOGICAL_ERROR;
}

/** 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 IProfilingBlockInputStream
{
public:

    InputStreamFromASTInsertQuery(const ASTPtr & ast, ReadBuffer & input_buffer_tail_part, const BlockIO & streams, Context & context);

    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"; }
    String getID() const override        { return "InputStreamFromASTInsertQuery(" + toString(std::intptr_t(this)) + ")"; }

private:

    std::unique_ptr<ReadBuffer> input_buffer_ast_part;
    std::unique_ptr<ReadBuffer> input_buffer_contacenated;

    BlockInputStreamPtr res_stream;
};

}