statistics: remove useless GetFullTableName (#52552) (#52588)

close #52553

Author: ti-chi-bot

pkg/statistics/handle/bootstrap.go

@@ -73,7 +73,6 @@ func (h *Handle) initStatsMeta4Chunk(is infoschema.InfoSchema, cache statstypes.
 		tbl := &statistics.Table{
 			HistColl:              newHistColl,
 			Version:               row.GetUint64(0),
-			Name:                  util.GetFullTableName(is, tableInfo),
 			ColAndIdxExistenceMap: statistics.NewColAndIndexExistenceMap(len(tableInfo.Columns), len(tableInfo.Indices)),
 			IsPkIsHandle:          tableInfo.PKIsHandle,
 		}

pkg/statistics/handle/cache/statscache.go

@@ -127,7 +127,6 @@ func (s *StatsCacheImpl) Update(is infoschema.InfoSchema) error {
 		tbl.Version = version
 		tbl.RealtimeCount = count
 		tbl.ModifyCount = modifyCount
-		tbl.Name = util.GetFullTableName(is, tableInfo)
 		tbl.TblInfoUpdateTS = tableInfo.UpdateTS
 		tables = append(tables, tbl)
 	}

pkg/statistics/handle/util/util.go

@@ -20,10 +20,8 @@ import (
 	"time"
 
 	"github.com/pingcap/errors"
-	"github.com/pingcap/tidb/pkg/infoschema"
 	"github.com/pingcap/tidb/pkg/kv"
 	"github.com/pingcap/tidb/pkg/parser/ast"
-	"github.com/pingcap/tidb/pkg/parser/model"
 	"github.com/pingcap/tidb/pkg/parser/terror"
 	"github.com/pingcap/tidb/pkg/sessionctx"
 	"github.com/pingcap/tidb/pkg/sessionctx/variable"
@@ -226,18 +224,6 @@ func DurationToTS(d time.Duration) uint64 {
 	return oracle.ComposeTS(d.Nanoseconds()/int64(time.Millisecond), 0)
 }
 
-// GetFullTableName returns the full table name.
-func GetFullTableName(is infoschema.InfoSchema, tblInfo *model.TableInfo) string {
-	for _, schemaName := range is.AllSchemaNames() {
-		if t, err := is.TableByName(schemaName, tblInfo.Name); err == nil {
-			if t.Meta().ID == tblInfo.ID {
-				return schemaName.O + "." + tblInfo.Name.O
-			}
-		}
-	}
-	return strconv.FormatInt(tblInfo.ID, 10)
-}
-
 // JSONTable is used for dumping statistics.
 type JSONTable struct {
 	Columns           map[string]*JSONColumn `json:"columns"`

pkg/statistics/table.go

@@ -61,7 +61,6 @@ type Table struct {
 	ExtendedStats *ExtendedStatsColl
 
 	ColAndIdxExistenceMap *ColAndIdxExistenceMap
-	Name                  string
 	HistColl
 	Version uint64
 	// It's the timestamp of the last analyze time.
@@ -427,7 +426,6 @@ func (t *Table) Copy() *Table {
 	nt := &Table{
 		HistColl:           newHistColl,
 		Version:            t.Version,
-		Name:               t.Name,
 		TblInfoUpdateTS:    t.TblInfoUpdateTS,
 		IsPkIsHandle:       t.IsPkIsHandle,
 		LastAnalyzeVersion: t.LastAnalyzeVersion,
@@ -465,7 +463,6 @@ func (t *Table) ShallowCopy() *Table {
 	nt := &Table{
 		HistColl:              newHistColl,
 		Version:               t.Version,
-		Name:                  t.Name,
 		TblInfoUpdateTS:       t.TblInfoUpdateTS,
 		ExtendedStats:         t.ExtendedStats,
 		ColAndIdxExistenceMap: t.ColAndIdxExistenceMap,