performance

type BatchExecutor struct {
	// contains filtered or unexported fields
}

type Index struct {
	Name        string
	TableName   string
	Columns     []string
	Unique      bool
	Primary     bool
	Cardinality int64 // 基数（唯一值数量）
}

type IndexManager struct {
	// contains filtered or unexported fields
}

type IndexStats struct {
	Name          string
	HitCount      int64
	MissCount     int64
	AvgAccessTime time.Duration
	LastAccessed  time.Time
}

type MemoryPool struct {
	// contains filtered or unexported fields
}

type PerformanceOptimizer struct {
	// contains filtered or unexported fields
}

type PlanNode struct {
	Plan     interface{} // LogicalPlan 在 optimizer 包中定义
	Cost     float64
	Priority int
	Index    int
}

type PriorityQueue []*PlanNode