tidb explain_format 源码
tidb explain_format 代码
文件路径：/types/explain_format.go
// Copyright 2021 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 types
var (
// ExplainFormatBrief is the same as ExplainFormatRow, but it ignores explain ID suffix.
ExplainFormatBrief = "brief"
// ExplainFormatDOT indicates that using DotGraph to explain.
ExplainFormatDOT = "dot"
// ExplainFormatHint is to show hint information.
ExplainFormatHint = "hint"
// ExplainFormatJSON displays the information in JSON format.
ExplainFormatJSON = "json"
// ExplainFormatROW presents the output in tabular format.
ExplainFormatROW = "row"
// ExplainFormatVerbose display additional information regarding the plan.
ExplainFormatVerbose = "verbose"
// ExplainFormatTraditional is the same as ExplainFormatROW.
ExplainFormatTraditional = "traditional"
// ExplainFormatTrueCardCost indicates the optimizer to use true cardinality to calculate the cost.
ExplainFormatTrueCardCost = "true_card_cost"
// ExplainFormatBinary prints the proto for binary plan.
ExplainFormatBinary = "binary"
// ExplainFormats stores the valid formats for explain statement, used by validator.
ExplainFormats = []string{
ExplainFormatBrief,
ExplainFormatDOT,
ExplainFormatHint,
ExplainFormatJSON,
ExplainFormatROW,
ExplainFormatVerbose,
ExplainFormatTraditional,
ExplainFormatTrueCardCost,
ExplainFormatBinary,
}
)
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