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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 handle
import (
"time"
"github.com/pingcap/errors"
"github.com/pingcap/parser/model"
"github.com/pingcap/parser/mysql"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/sessionctx/stmtctx"
"github.com/pingcap/tidb/statistics"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/sqlexec"
"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]*jsonColumn `json:"indices"`
Count int64 `json:"count"`
ModifyCount int64 `json:"modify_count"`
Partitions map[string]*JSONTable `json:"partitions"`
}
type jsonColumn struct {
Histogram *tipb.Histogram `json:"histogram"`
CMSketch *tipb.CMSketch `json:"cm_sketch"`
NullCount int64 `json:"null_count"`
TotColSize int64 `json:"tot_col_size"`
LastUpdateVersion uint64 `json:"last_update_version"`
Correlation float64 `json:"correlation"`
}
func dumpJSONCol(hist *statistics.Histogram, CMSketch *statistics.CMSketch) *jsonColumn {
jsonCol := &jsonColumn{
Histogram: statistics.HistogramToProto(hist),
NullCount: hist.NullCount,
TotColSize: hist.TotColSize,
LastUpdateVersion: hist.LastUpdateVersion,
Correlation: hist.Correlation,
}
if CMSketch != nil {
jsonCol.CMSketch = statistics.CMSketchToProto(CMSketch)
}
return jsonCol
}
// DumpStatsToJSON dumps statistic to json.
func (h *Handle) DumpStatsToJSON(dbName string, tableInfo *model.TableInfo, historyStatsExec sqlexec.RestrictedSQLExecutor) (*JSONTable, error) {
pi := tableInfo.GetPartitionInfo()
if pi == nil {
return h.tableStatsToJSON(dbName, tableInfo, tableInfo.ID, historyStatsExec)
}
jsonTbl := &JSONTable{
DatabaseName: dbName,
TableName: tableInfo.Name.L,
Partitions: make(map[string]*JSONTable, len(pi.Definitions)),
}
for _, def := range pi.Definitions {
tbl, err := h.tableStatsToJSON(dbName, tableInfo, def.ID, historyStatsExec)
if err != nil {
return nil, errors.Trace(err)
}
if tbl == nil {
continue
}
jsonTbl.Partitions[def.Name.L] = tbl
}
return jsonTbl, nil
}
func (h *Handle) tableStatsToJSON(dbName string, tableInfo *model.TableInfo, physicalID int64, historyStatsExec sqlexec.RestrictedSQLExecutor) (*JSONTable, error) {
tbl, err := h.tableStatsFromStorage(tableInfo, physicalID, true, historyStatsExec)
if err != nil || tbl == nil {
return nil, err
}
tbl.Version, tbl.ModifyCount, tbl.Count, err = h.statsMetaByTableIDFromStorage(physicalID, historyStatsExec)
if err != nil {
return nil, err
}
jsonTbl := &JSONTable{
DatabaseName: dbName,
TableName: tableInfo.Name.L,
Columns: make(map[string]*jsonColumn, len(tbl.Columns)),
Indices: make(map[string]*jsonColumn, len(tbl.Indices)),
Count: tbl.Count,
ModifyCount: tbl.ModifyCount,
}
for _, col := range tbl.Columns {
sc := &stmtctx.StatementContext{TimeZone: time.UTC}
hist, err := col.ConvertTo(sc, types.NewFieldType(mysql.TypeBlob))
if err != nil {
return nil, errors.Trace(err)
}
jsonTbl.Columns[col.Info.Name.L] = dumpJSONCol(hist, col.CMSketch)
}
for _, idx := range tbl.Indices {
jsonTbl.Indices[idx.Info.Name.L] = dumpJSONCol(&idx.Histogram, idx.CMSketch)
}
return jsonTbl, nil
}
// LoadStatsFromJSON will load statistic from JSONTable, and save it to the storage.
func (h *Handle) LoadStatsFromJSON(is infoschema.InfoSchema, jsonTbl *JSONTable) error {
table, err := is.TableByName(model.NewCIStr(jsonTbl.DatabaseName), model.NewCIStr(jsonTbl.TableName))
if err != nil {
return errors.Trace(err)
}
tableInfo := table.Meta()
pi := tableInfo.GetPartitionInfo()
if pi == nil {
err := h.loadStatsFromJSON(tableInfo, tableInfo.ID, jsonTbl)
if err != nil {
return errors.Trace(err)
}
} else {
if jsonTbl.Partitions == nil {
return errors.New("No partition statistics")
}
for _, def := range pi.Definitions {
tbl := jsonTbl.Partitions[def.Name.L]
if tbl == nil {
continue
}
err := h.loadStatsFromJSON(tableInfo, def.ID, tbl)
if err != nil {
return errors.Trace(err)
}
}
}
return errors.Trace(h.Update(is))
}
func (h *Handle) loadStatsFromJSON(tableInfo *model.TableInfo, physicalID int64, jsonTbl *JSONTable) error {
tbl, err := TableStatsFromJSON(tableInfo, physicalID, jsonTbl)
if err != nil {
return errors.Trace(err)
}
for _, col := range tbl.Columns {
err = h.SaveStatsToStorage(tbl.PhysicalID, tbl.Count, 0, &col.Histogram, col.CMSketch, 1)
if err != nil {
return errors.Trace(err)
}
}
for _, idx := range tbl.Indices {
err = h.SaveStatsToStorage(tbl.PhysicalID, tbl.Count, 1, &idx.Histogram, idx.CMSketch, 1)
if err != nil {
return errors.Trace(err)
}
}
err = h.SaveMetaToStorage(tbl.PhysicalID, tbl.Count, tbl.ModifyCount)
return err
}
// TableStatsFromJSON loads statistic from JSONTable and return the Table of statistic.
func TableStatsFromJSON(tableInfo *model.TableInfo, physicalID int64, jsonTbl *JSONTable) (*statistics.Table, error) {
newHistColl := statistics.HistColl{
PhysicalID: physicalID,
HavePhysicalID: true,
Count: jsonTbl.Count,
ModifyCount: jsonTbl.ModifyCount,
Columns: make(map[int64]*statistics.Column, len(jsonTbl.Columns)),
Indices: make(map[int64]*statistics.Index, len(jsonTbl.Indices)),
}
tbl := &statistics.Table{
HistColl: newHistColl,
}
for id, jsonIdx := range jsonTbl.Indices {
for _, idxInfo := range tableInfo.Indices {
if idxInfo.Name.L != id {
continue
}
hist := statistics.HistogramFromProto(jsonIdx.Histogram)
hist.ID, hist.NullCount, hist.LastUpdateVersion, hist.Correlation = idxInfo.ID, jsonIdx.NullCount, jsonIdx.LastUpdateVersion, jsonIdx.Correlation
idx := &statistics.Index{
Histogram: *hist,
CMSketch: statistics.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
}
hist := statistics.HistogramFromProto(jsonCol.Histogram)
count := int64(hist.TotalRowCount())
sc := &stmtctx.StatementContext{TimeZone: time.UTC}
hist, err := hist.ConvertTo(sc, &colInfo.FieldType)
if err != nil {
return nil, errors.Trace(err)
}
hist.ID, hist.NullCount, hist.LastUpdateVersion, hist.TotColSize, hist.Correlation = colInfo.ID, jsonCol.NullCount, jsonCol.LastUpdateVersion, jsonCol.TotColSize, jsonCol.Correlation
col := &statistics.Column{
PhysicalID: physicalID,
Histogram: *hist,
CMSketch: statistics.CMSketchFromProto(jsonCol.CMSketch),
Info: colInfo,
Count: count,
IsHandle: tableInfo.PKIsHandle && mysql.HasPriKeyFlag(colInfo.Flag),
}
tbl.Columns[col.ID] = col
}
}
return tbl, nil
}