mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-22 07:31:57 +00:00
450 lines
10 KiB
C++
450 lines
10 KiB
C++
#pragma once
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#include <DB/Core/Field.h>
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#include <DB/IO/WriteHelpers.h>
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#include <Poco/Timespan.h>
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namespace DB
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{
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/** Одна настройка какого-либо типа.
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* Хранит внутри себя значение, а также флаг - было ли значение изменено.
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* Это сделано, чтобы можно было отправлять на удалённые серверы только изменённые (или явно указанные в конфиге) значения.
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* То есть, если настройка не была указана в конфиге и не была изменена динамически, то она не отправляется на удалённый сервер,
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* и удалённый сервер будет использовать своё значение по-умолчанию.
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*/
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struct SettingUInt64
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{
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UInt64 value;
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bool changed = false;
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SettingUInt64(UInt64 x = 0) : value(x) {}
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operator UInt64() const { return value; }
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SettingUInt64 & operator= (UInt64 x) { set(x); return *this; }
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String toString() const
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{
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return DB::toString(value);
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}
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void set(UInt64 x)
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{
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value = x;
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changed = true;
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}
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void set(const Field & x)
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{
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set(safeGet<UInt64>(x));
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}
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void set(const String & x)
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{
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set(parse<UInt64>(x));
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}
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void set(ReadBuffer & buf)
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{
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UInt64 x = 0;
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readVarUInt(x, buf);
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set(x);
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}
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void write(WriteBuffer & buf) const
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{
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writeVarUInt(value, buf);
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}
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};
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typedef SettingUInt64 SettingBool;
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struct SettingSeconds
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{
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Poco::Timespan value;
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bool changed = false;
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SettingSeconds(UInt64 seconds = 0) : value(seconds, 0) {}
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operator Poco::Timespan() const { return value; }
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SettingSeconds & operator= (Poco::Timespan x) { set(x); return *this; }
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Poco::Timespan::TimeDiff totalSeconds() const { return value.totalSeconds(); }
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String toString() const
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{
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return DB::toString(totalSeconds());
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}
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void set(Poco::Timespan x)
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{
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value = x;
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changed = true;
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}
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void set(UInt64 x)
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{
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set(Poco::Timespan(x, 0));
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}
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void set(const Field & x)
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{
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set(safeGet<UInt64>(x));
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}
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void set(const String & x)
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{
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set(parse<UInt64>(x));
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}
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void set(ReadBuffer & buf)
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{
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UInt64 x = 0;
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readVarUInt(x, buf);
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set(x);
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}
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void write(WriteBuffer & buf) const
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{
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writeVarUInt(value.totalSeconds(), buf);
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}
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};
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struct SettingMilliseconds
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{
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Poco::Timespan value;
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bool changed = false;
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SettingMilliseconds(UInt64 milliseconds = 0) : value(milliseconds * 1000) {}
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operator Poco::Timespan() const { return value; }
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SettingMilliseconds & operator= (Poco::Timespan x) { set(x); return *this; }
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Poco::Timespan::TimeDiff totalMilliseconds() const { return value.totalMilliseconds(); }
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String toString() const
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{
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return DB::toString(totalMilliseconds());
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}
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void set(Poco::Timespan x)
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{
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value = x;
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changed = true;
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}
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void set(UInt64 x)
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{
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set(Poco::Timespan(x * 1000));
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}
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void set(const Field & x)
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{
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set(safeGet<UInt64>(x));
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}
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void set(const String & x)
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{
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set(parse<UInt64>(x));
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}
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void set(ReadBuffer & buf)
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{
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UInt64 x = 0;
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readVarUInt(x, buf);
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set(x);
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}
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void write(WriteBuffer & buf) const
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{
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writeVarUInt(value.totalMilliseconds(), buf);
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}
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};
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struct SettingFloat
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{
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float value;
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bool changed = false;
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SettingFloat(float x = 0) : value(x) {}
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operator float() const { return value; }
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SettingFloat & operator= (float x) { set(x); return *this; }
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String toString() const
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{
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return DB::toString(value);
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}
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void set(float x)
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{
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value = x;
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changed = true;
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}
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void set(const Field & x)
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{
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if (x.getType() == Field::Types::UInt64)
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{
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set(safeGet<UInt64>(x));
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}
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else if (x.getType() == Field::Types::Int64)
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{
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set(safeGet<Int64>(x));
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}
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else if (x.getType() == Field::Types::Float64)
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{
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set(safeGet<Float64>(x));
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}
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else
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throw Exception(std::string("Bad type of setting. Expected UInt64, Int64 or Float64, got ") + x.getTypeName(), ErrorCodes::TYPE_MISMATCH);
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}
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void set(const String & x)
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{
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set(parse<float>(x));
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}
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void set(ReadBuffer & buf)
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{
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String x;
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readBinary(x, buf);
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set(x);
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}
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void write(WriteBuffer & buf) const
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{
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writeBinary(toString(), buf);
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}
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};
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enum class LoadBalancing
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{
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/// среди реплик с минимальным количеством ошибок выбирается случайная
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RANDOM = 0,
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/// среди реплик с минимальным количеством ошибок выбирается реплика
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/// с минимальным количеством отличающихся символов в имени реплики и имени локального хоста
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NEAREST_HOSTNAME
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};
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struct SettingLoadBalancing
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{
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LoadBalancing value;
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bool changed = false;
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SettingLoadBalancing(LoadBalancing x) : value(x) {}
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operator LoadBalancing() const { return value; }
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SettingLoadBalancing & operator= (LoadBalancing x) { set(x); return *this; }
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static LoadBalancing getLoadBalancing(const String & s)
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{
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if (s == "random") return LoadBalancing::RANDOM;
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if (s == "nearest_hostname") return LoadBalancing::NEAREST_HOSTNAME;
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throw Exception("Unknown load balancing mode: '" + s + "', must be one of 'random', 'nearest_hostname'", ErrorCodes::UNKNOWN_LOAD_BALANCING);
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}
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String toString() const
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{
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const char * strings[] = {"random", "nearest_hostname"};
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if (value < LoadBalancing::RANDOM || value > LoadBalancing::NEAREST_HOSTNAME)
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throw Exception("Unknown load balancing mode", ErrorCodes::UNKNOWN_OVERFLOW_MODE);
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return strings[static_cast<size_t>(value)];
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}
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void set(LoadBalancing x)
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{
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value = x;
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changed = true;
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}
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void set(const Field & x)
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{
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set(safeGet<const String &>(x));
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}
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void set(const String & x)
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{
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set(getLoadBalancing(x));
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}
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void set(ReadBuffer & buf)
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{
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String x;
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readBinary(x, buf);
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set(x);
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}
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void write(WriteBuffer & buf) const
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{
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writeBinary(toString(), buf);
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}
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};
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/// Какие строки включать в TOTALS.
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enum class TotalsMode
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{
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BEFORE_HAVING = 0, /// Считать HAVING по всем прочитанным строкам;
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/// включая не попавшие в max_rows_to_group_by
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/// и не прошедшие HAVING после группировки.
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AFTER_HAVING_INCLUSIVE = 1, /// Считать по всем строкам, кроме не прошедших HAVING;
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/// то есть, включать в TOTALS все строки, не прошедшие max_rows_to_group_by.
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AFTER_HAVING_EXCLUSIVE = 2, /// Включать только строки, прошедшие и max_rows_to_group_by, и HAVING.
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AFTER_HAVING_AUTO = 3, /// Автоматически выбирать между INCLUSIVE и EXCLUSIVE,
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};
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struct SettingTotalsMode
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{
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TotalsMode value;
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bool changed = false;
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SettingTotalsMode(TotalsMode x) : value(x) {}
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operator TotalsMode() const { return value; }
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SettingTotalsMode & operator= (TotalsMode x) { set(x); return *this; }
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static TotalsMode getTotalsMode(const String & s)
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{
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if (s == "before_having") return TotalsMode::BEFORE_HAVING;
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if (s == "after_having_exclusive") return TotalsMode::AFTER_HAVING_EXCLUSIVE;
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if (s == "after_having_inclusive") return TotalsMode::AFTER_HAVING_INCLUSIVE;
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if (s == "after_having_auto") return TotalsMode::AFTER_HAVING_AUTO;
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throw Exception("Unknown totals mode: '" + s + "', must be one of 'before_having', 'after_having_exclusive', 'after_having_inclusive', 'after_having_auto'", ErrorCodes::UNKNOWN_TOTALS_MODE);
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}
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String toString() const
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{
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switch (value)
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{
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case TotalsMode::BEFORE_HAVING: return "before_having";
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case TotalsMode::AFTER_HAVING_EXCLUSIVE: return "after_having_exclusive";
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case TotalsMode::AFTER_HAVING_INCLUSIVE: return "after_having_inclusive";
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case TotalsMode::AFTER_HAVING_AUTO: return "after_having_auto";
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default:
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throw Exception("Unknown TotalsMode enum value", ErrorCodes::ARGUMENT_OUT_OF_BOUND);
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}
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}
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void set(TotalsMode x)
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{
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value = x;
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changed = true;
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}
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void set(const Field & x)
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{
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set(safeGet<const String &>(x));
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}
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void set(const String & x)
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{
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set(getTotalsMode(x));
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}
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void set(ReadBuffer & buf)
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{
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String x;
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readBinary(x, buf);
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set(x);
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}
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void write(WriteBuffer & buf) const
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{
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writeBinary(toString(), buf);
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}
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};
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/// Что делать, если ограничение превышено.
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enum class OverflowMode
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{
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THROW = 0, /// Кинуть исключение.
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BREAK = 1, /// Прервать выполнение запроса, вернуть что есть.
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ANY = 2, /** Только для GROUP BY: не добавлять новые строки в набор,
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* но продолжать агрегировать для ключей, успевших попасть в набор.
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*/
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};
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template <bool enable_mode_any>
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struct SettingOverflowMode
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{
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OverflowMode value;
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bool changed = false;
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SettingOverflowMode(OverflowMode x = OverflowMode::THROW) : value(x) {}
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operator OverflowMode() const { return value; }
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SettingOverflowMode & operator= (OverflowMode x) { set(x); return *this; }
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static OverflowMode getOverflowModeForGroupBy(const String & s)
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{
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if (s == "throw") return OverflowMode::THROW;
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if (s == "break") return OverflowMode::BREAK;
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if (s == "any") return OverflowMode::ANY;
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throw Exception("Unknown overflow mode: '" + s + "', must be one of 'throw', 'break', 'any'", ErrorCodes::UNKNOWN_OVERFLOW_MODE);
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}
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static OverflowMode getOverflowMode(const String & s)
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{
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OverflowMode mode = getOverflowModeForGroupBy(s);
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if (mode == OverflowMode::ANY && !enable_mode_any)
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throw Exception("Illegal overflow mode: 'any' is only for 'group_by_overflow_mode'", ErrorCodes::ILLEGAL_OVERFLOW_MODE);
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return mode;
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}
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String toString() const
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{
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const char * strings[] = { "throw", "break", "any" };
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if (value < OverflowMode::THROW || value > OverflowMode::ANY)
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throw Exception("Unknown overflow mode", ErrorCodes::UNKNOWN_OVERFLOW_MODE);
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return strings[static_cast<size_t>(value)];
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}
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void set(OverflowMode x)
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{
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value = x;
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changed = true;
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}
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void set(const Field & x)
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{
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set(safeGet<const String &>(x));
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}
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void set(const String & x)
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{
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set(getOverflowMode(x));
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}
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void set(ReadBuffer & buf)
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{
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String x;
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readBinary(x, buf);
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set(x);
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}
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void write(WriteBuffer & buf) const
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{
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writeBinary(toString(), buf);
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}
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};
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}
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