planner: forbid generate PointGet plan with partition table + _tidb_rowid

pkg/planner/core/find_best_task.go

@@ -1401,6 +1401,7 @@ func (ds *DataSource) FindBestTask(prop *property.PhysicalProperty, planCounter
 		if canConvertPointGet && ds.table.Meta().GetPartitionInfo() != nil {
 			// partition table with dynamic prune not support batchPointGet
 			// Due to sorting?
+			// Please make sure handle `where _tidb_rowid in (xx, xx)` correctly when delete this if statements.
 			if canConvertPointGet && len(path.Ranges) > 1 && ds.SCtx().GetSessionVars().StmtCtx.UseDynamicPartitionPrune() {
 				canConvertPointGet = false
 			}
@@ -1418,6 +1419,10 @@ func (ds *DataSource) FindBestTask(prop *property.PhysicalProperty, planCounter
 					canConvertPointGet = false
 				}
 			}
+			// Partition table can't use `_tidb_rowid` to generate PointGet Plan unless one partition is explicitly specified.
+			if canConvertPointGet && path.IsIntHandlePath && !ds.table.Meta().PKIsHandle && len(ds.PartitionNames) != 1 {
+				canConvertPointGet = false
+			}
 			if canConvertPointGet {
 				if path != nil && path.Index != nil && path.Index.Global {
 					// Don't convert to point get during ddl

pkg/planner/core/point_get_plan.go

@@ -339,6 +339,17 @@ func (p *PointGetPlan) PrunePartitions(sctx sessionctx.Context) bool {
 		// reading for the Global Index / table id
 		return false
 	}
+	// _tidb_rowid + specify a partition
+	if p.IndexInfo == nil && !p.TblInfo.HasClusteredIndex() && len(p.PartitionNames) == 1 {
+		for i, def := range pi.Definitions {
+			if def.Name.L == p.PartitionNames[0].L {
+				idx := i
+				p.PartitionIdx = &idx
+				break
+			}
+		}
+		return false
+	}
 	// If tryPointGetPlan did generate the plan,
 	// then PartitionIdx is not set and needs to be set here!
 	// There are two ways to get here from static mode partition pruning:
@@ -1709,7 +1720,11 @@ func getNameValuePairs(ctx base.PlanContext, tbl *model.TableInfo, tblName model
 			return nil, false
 		}
 		col := model.FindColumnInfo(tbl.Cols(), colName.Name.Name.L)
-		if col == nil { // Handling the case when the column is _tidb_rowid.
+		if col == nil {
+			// Partition table can't use `_tidb_rowid` to generate PointGet Plan.
+			if tbl.GetPartitionInfo() != nil && colName.Name.Name.L == model.ExtraHandleName.L {
+				return nil, false
+			}
 			return append(nvPairs, nameValuePair{colName: colName.Name.Name.L, colFieldType: types.NewFieldType(mysql.TypeLonglong), value: d, con: con}), false
 		}