process

type Limitation struct {
	// Size, memory threshold.
	Size int64
	// BatchRows, max rows for batch.
	BatchRows int64
	// BatchSize, max size for batch.
	BatchSize int64
	// PartitionRows, max rows for partition.
	PartitionRows int64
}

type Process struct {
	// Id, query id.
	Id  string
	Reg Register
	Lim Limitation
	Mp  *mheap.Mheap

	// unix timestamp
	UnixTime int64

	// snapshot is transaction context
	Snapshot []byte

	SessionInfo SessionInfo

	// snapshot is transaction context
	Cancel context.CancelFunc
}

type Register struct {
	// Ss, temporarily stores the row number list in the execution of operators
	// and it can be reused in the future execution.
	Ss [][]int64
	// InputBatch, stores the result of the previous operator.
	InputBatch *batch.Batch
	// Vecs, temporarily stores the column data in the execution of operators
	// and it can be reused in the future execution to avoid mem alloc and type casting overhead.
	Vecs []*vector.Vector
	// MergeReceivers, receives result of multi previous operators from other pipelines
	// e.g. merge operator.
	MergeReceivers []*WaitRegister
}

type SessionInfo struct {
	User         string
	Host         string
	Role         string
	ConnectionID uint64
	Database     string
	Version      string
}

type WaitRegister struct {
	Ctx context.Context
	Ch  chan *batch.Batch
}