tidb analyze 源码
tidb analyze 代码
文件路径：/statistics/analyze.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 statistics
import (
"fmt"
)
// AnalyzeTableID is hybrid table id used to analyze table.
type AnalyzeTableID struct {
TableID int64
// PartitionID is used for the construction of partition table statistics. It indicate the ID of the partition.
// If the table is not the partition table, the PartitionID will be equal to -1.
PartitionID int64
}
// GetStatisticsID is used to obtain the table ID to build statistics.
// If the 'PartitionID == -1', we use the TableID to build the statistics for non-partition tables.
// Otherwise, we use the PartitionID to build the statistics of the partitions in the partition tables.
func (h *AnalyzeTableID) GetStatisticsID() int64 {
statisticsID := h.TableID
if h.PartitionID != -1 {
statisticsID = h.PartitionID
}
return statisticsID
}
// IsPartitionTable indicates whether the table is partition table.
func (h *AnalyzeTableID) IsPartitionTable() bool {
return h.PartitionID != -1
}
func (h *AnalyzeTableID) String() string {
return fmt.Sprintf("%d => %v", h.PartitionID, h.TableID)
}
// Equals indicates whether two table id is equal.
func (h *AnalyzeTableID) Equals(t *AnalyzeTableID) bool {
if h == t {
return true
}
if h == nil || t == nil {
return false
}
return h.TableID == t.TableID && h.PartitionID == t.PartitionID
}
// AnalyzeResult is used to represent analyze result.
type AnalyzeResult struct {
Hist []*Histogram
Cms []*CMSketch
TopNs []*TopN
Fms []*FMSketch
IsIndex int
}
// AnalyzeResults represents the analyze results of a task.
type AnalyzeResults struct {
TableID AnalyzeTableID
Ars []*AnalyzeResult
Count int64
ExtStats *ExtendedStatsColl
Err error
Job *AnalyzeJob
StatsVer int
Snapshot uint64
// BaseCount is the original count in mysql.stats_meta at the beginning of analyze.
BaseCount int64
// BaseModifyCnt is the original modify_count in mysql.stats_meta at the beginning of analyze.
BaseModifyCnt int64
}
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