router

type DateDayShard struct {
}

type DateMonthShard struct {
}

type DateYearShard struct {
}

type DefaultShard struct {
}

type HashShard struct {
	ShardNum int
}

type KeyError string

type NumKeyRange struct {
	Start int64
	End   int64
}

type NumRangeShard struct {
	Shards []NumKeyRange
}

type Plan struct {
	Rule *Rule

	Criteria sqlparser.SQLNode
	KeyIndex int //used for insert/replace to find shard key idx
	//used for insert/replace values,key is table index,and value is
	//the rows for insert or replace.
	Rows map[int]sqlparser.Values

	SubTableValueGroups map[int]sqlparser.ValTuple //按照tableIndex存放ValueExpr
	InRightToReplace    *sqlparser.ComparisonExpr  //记录in的右边Expr,用来动态替换不同table in的值
	RouteTableIndexs    []int
	RouteNodeIndexs     []int
	RewrittenSqls       map[string][]string
}

type RangeShard interface {
	Shard
	EqualStart(key interface{}, index int) bool
	EqualStop(key interface{}, index int) bool
}

type Router struct {
	//map[db]map[table_name]*Rule
	Rules       map[string]map[string]*Rule
	DefaultRule *Rule
	Nodes       []string //just for human saw
}

type Rule struct {
	DB    string
	Table string
	Key   string

	Type           string
	Nodes          []string
	SubTableIndexs []int       //SubTableIndexs store all the index of sharding sub-table,sequential
	TableToNode    map[int]int //key is table index, and value is node index
	Shard          Shard
}

type Shard interface {
	FindForKey(key interface{}) (int, error)
}

type Uint64Key uint64