AofExpireCtx 记录在执行命令时，是否需要AOF持久化，是否有过期时间

ArgNumErrReply represents wrong number of arguments for command

Cluster 用于和集群中的主机进行交互

Connection represents a connection with a client

Connection represents a connection with a client

Consumer traverses list. It receives index and value as params, returns true to continue traversal, while returns false to break

Consumer is used to traversal dict, if it returns false the traversal will be break

Coordinator TCC事务协调者

DB is the interface for redis style storage engine

DBEngine is the embedding storage engine exposing more methods for complex application

DataEntity stores data bound to a key, including a string, list, hash, set and so on

Dict is interface of a key-value data structure

ExecFunc is interface for command executor args don't include cmd line

Expected check whether given item is equals to expected value

HashFunc defines function to generate hash code

IntReply stores an int64 number

NoReply respond nothing, for commands like subscribe

* OK REPLY */ OkReply is +OK

* PONG REPLY */

Pool 连接池

PreFunc returns related write keys and read keys

QuickList 快速链表，用于实现list

Reply 表示 redis 序列化协议中的一条消息

ScoreBorder represents range of a float value, including: <, <=, >, >=, +inf, -inf

Server is a redis-server

ServerProperties 服务器配置

SimpleDict 简单的mapp，非线程安全，用于aof重写建立的临时辅助数据库

StatusReply 记录 RESP 中的状态信息（以+开头的信息）

SyntaxErrReply represents meeting unexpected arguments

Transaction TCC本地事务

Wait a sync.WaitGroup with timeout

WrongTypeErrReply represents operation against a key holding the wrong kind of value

迭代器，在[-1, ql.Len()]之间移动

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