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dump.go
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dump.go
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// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package statistics
import (
"github.com/juju/errors"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tipb/go-tipb"
)
// JSONTable is used for dumping statistics.
type JSONTable struct {
DatabaseName string `json:"database_name"`
TableName string `json:"table_name"`
Columns map[string]*jsonColumn `json:"columns"`
Indices map[string]*jsonIndex `json:"indices"`
Count int64 `json:"count"`
ModifyCount int64 `json:"modify_count"`
Version uint64 `json:"version"`
}
type jsonColumn struct {
Histogram *tipb.Histogram `json:"histogram"`
CMSketch *tipb.CMSketch `json:"cm_sketch"`
AlreadyLoad bool `json:"already_load"`
NullCount int64 `json:"null_count"`
LastUpdateVersion uint64 `json:"last_update_version"`
}
type jsonIndex struct {
Histogram *tipb.Histogram `json:"histogram"`
CMSketch *tipb.CMSketch `json:"cm_sketch"`
NullCount int64 `json:"null_count"`
LastUpdateVersion uint64 `json:"last_update_version"`
}
// DumpStatsToJSON dumps statistic to json.
func (h *Handle) DumpStatsToJSON(dbName string, tableInfo *model.TableInfo) (*JSONTable, error) {
statsTable := h.statsCache.Load().(statsCache)[tableInfo.ID]
tbl, err := h.tableStatsFromStorage(tableInfo, true)
if err != nil {
return nil, errors.Trace(err)
}
jsonTbl := &JSONTable{
DatabaseName: dbName,
TableName: tableInfo.Name.L,
Columns: make(map[string]*jsonColumn, len(tbl.Columns)),
Indices: make(map[string]*jsonIndex, len(tbl.Indices)),
Count: tbl.Count,
ModifyCount: tbl.ModifyCount,
Version: tbl.Version,
}
for id, col := range tbl.Columns {
hist, err := col.ConvertTo(h.ctx.GetSessionVars().StmtCtx, types.NewFieldType(mysql.TypeBlob))
if err != nil {
return nil, errors.Trace(err)
}
// c is the Column in Cache.
c := statsTable.Columns[id]
jsonCol := &jsonColumn{
Histogram: HistogramToProto(hist),
AlreadyLoad: !(c.Count > 0 && c.Len() == 0),
NullCount: col.NullCount,
LastUpdateVersion: col.LastUpdateVersion,
}
if col.CMSketch != nil {
jsonCol.CMSketch = CMSketchToProto(col.CMSketch)
}
jsonTbl.Columns[col.Info.Name.L] = jsonCol
}
for _, idx := range tbl.Indices {
jsonIdx := &jsonIndex{
Histogram: HistogramToProto(&idx.Histogram),
NullCount: idx.NullCount,
LastUpdateVersion: idx.LastUpdateVersion,
}
if idx.CMSketch != nil {
jsonIdx.CMSketch = CMSketchToProto(idx.CMSketch)
}
jsonTbl.Indices[idx.Info.Name.L] = jsonIdx
}
return jsonTbl, nil
}
// LoadStatsFromJSON load statistic from json.
func (h *Handle) LoadStatsFromJSON(tableInfo *model.TableInfo, jsonTbl *JSONTable) (*Table, error) {
tbl := &Table{
TableID: tableInfo.ID,
Columns: make(map[int64]*Column, len(jsonTbl.Columns)),
Indices: make(map[int64]*Index, len(jsonTbl.Indices)),
Count: jsonTbl.Count,
Version: jsonTbl.Version,
ModifyCount: jsonTbl.ModifyCount,
}
for id, jsonIdx := range jsonTbl.Indices {
for _, idxInfo := range tableInfo.Indices {
if idxInfo.Name.L != id {
continue
}
hist := HistogramFromProto(jsonIdx.Histogram)
hist.ID, hist.NullCount, hist.LastUpdateVersion = idxInfo.ID, jsonIdx.NullCount, jsonIdx.LastUpdateVersion
hist.PreCalculateScalar()
idx := &Index{
Histogram: *hist,
CMSketch: CMSketchFromProto(jsonIdx.CMSketch),
Info: idxInfo,
}
tbl.Indices[idx.ID] = idx
}
}
for id, jsonCol := range jsonTbl.Columns {
for _, colInfo := range tableInfo.Columns {
if colInfo.Name.L != id {
continue
}
col := &Column{
Histogram: Histogram{ID: colInfo.ID, NullCount: jsonCol.NullCount, LastUpdateVersion: jsonCol.LastUpdateVersion, NDV: jsonCol.Histogram.Ndv},
Info: colInfo,
}
hist := HistogramFromProto(jsonCol.Histogram)
col.Count = int64(hist.totalRowCount())
if !jsonCol.AlreadyLoad {
tbl.Columns[col.ID] = col
continue
}
col.CMSketch = CMSketchFromProto(jsonCol.CMSketch)
hist, err := hist.ConvertTo(h.ctx.GetSessionVars().StmtCtx, &colInfo.FieldType)
if err != nil {
return nil, errors.Trace(err)
}
hist.ID, hist.NullCount, hist.LastUpdateVersion = col.ID, col.NullCount, col.LastUpdateVersion
hist.PreCalculateScalar()
col.Histogram = *hist
tbl.Columns[col.ID] = col
}
}
return tbl, nil
}