infoschema: don't display tables in MemDB when query `TIDB_HOT_REGION…

…S` (#52180) (#52204)

close #50810

executor/infoschema_reader.go

@@ -1851,17 +1851,17 @@ func (e *memtableRetriever) setDataForTiDBHotRegions(ctx sessionctx.Context) err
  if !ok {
  return errors.New("Information about hot region can be gotten only when the storage is TiKV")
  }
- allSchemas := ctx.GetInfoSchema().(infoschema.InfoSchema).AllSchemas()
  tikvHelper := &helper.Helper{
  Store: tikvStore,
  RegionCache: tikvStore.GetRegionCache(),
  }
- metrics, err := tikvHelper.ScrapeHotInfo(pdapi.HotRead, allSchemas)
+ schemas := tikvHelper.FilterMemDBs(sessiontxn.GetTxnManager(ctx).GetTxnInfoSchema().AllSchemas())
+ metrics, err := tikvHelper.ScrapeHotInfo(pdapi.HotRead, schemas)
  if err != nil {
  return err
  }
  e.setDataForHotRegionByMetrics(metrics, "read")
- metrics, err = tikvHelper.ScrapeHotInfo(pdapi.HotWrite, allSchemas)
+ metrics, err = tikvHelper.ScrapeHotInfo(pdapi.HotWrite, schemas)
  if err != nil {
  return err
  }