tidb task_type 代码
文件路径：/planner/property/task_type.go
/ Copyright 2018 PingCAP, Inc.
/
/ Licensed under the Apache License, Version 2.0 (the "License");
/ you may not use this file except in compliance with the License.
/ You may obtain a copy of the License at
/
/ http://www.apache.org/licenses/LICENSE-2.0
/
/ Unless required by applicable law or agreed to in writing, software
/ distributed under the License is distributed on an "AS IS" BASIS,
/ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/ See the License for the specific language governing permissions and
/ limitations under the License.
package property
/ TaskType is the type of execution task.
type TaskType int
const (
/ RootTaskType stands for the tasks that executed in the TiDB layer.
RootTaskType TaskType = iota
/ CopSingleReadTaskType stands for the a TableScan or IndexScan tasks
/ executed in the coprocessor layer.
CopSingleReadTaskType
/ CopDoubleReadTaskType stands for the a IndexLookup tasks executed in the
/ coprocessor layer.
CopDoubleReadTaskType
/ MppTaskType stands for task that would run on Mpp nodes, currently meaning the tiflash node.
MppTaskType
)
/ String implements fmt.Stringer interface.
func (t TaskType) String() string {
switch t {
case RootTaskType:
return "rootTask"
case CopSingleReadTaskType:
return "copSingleReadTask"
case CopDoubleReadTaskType:
return "copDoubleReadTask"
case MppTaskType:
return "mppTask"
}
return "UnknownTaskType"
}