tidb task_type 源码
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"
}
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