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#pragma once
#include "ConnectionParameters.h"
#include <Client/Connection.h>
#include <Client/IServerConnection.h>
#include <Client/LocalConnection.h>
#include <Client/LineReader.h>
#include <IO/ConnectionTimeouts.h>
#include <atomic>
#include <thread>
namespace DB
{
class Suggest : public LineReader::Suggest, boost::noncopyable
{
public:
Suggest();
~Suggest()
{
if (loading_thread.joinable())
loading_thread.join();
}
/// Load suggestions for clickhouse-client.
template <typename ConnectionType>
void load(ContextPtr context, const ConnectionParameters & connection_parameters, Int32 suggestion_limit);
void load(IServerConnection & connection,
const ConnectionTimeouts & timeouts,
Int32 suggestion_limit);
/// Older server versions cannot execute the query loading suggestions.
static constexpr int MIN_SERVER_REVISION = DBMS_MIN_PROTOCOL_VERSION_WITH_VIEW_IF_PERMITTED;
int getLastError() const { return last_error.load(); }
private:
void fetch(IServerConnection & connection, const ConnectionTimeouts & timeouts, const std::string & query);
void fillWordsFromBlock(const Block & block);
/// Words are fetched asynchronously.
std::thread loading_thread;
std::atomic<int> last_error { -1 };
};
}
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