diff --git a/pkg/expression/aggregation/base_func.go b/pkg/expression/aggregation/base_func.go
index 3de4f3299d976..39a1b518ea8c7 100644
--- a/pkg/expression/aggregation/base_func.go
+++ b/pkg/expression/aggregation/base_func.go
@@ -214,6 +214,11 @@ func (a *baseFuncDesc) TypeInfer4AvgSum(avgRetType *types.FieldType) {
 	}
 }
 
+// TypeInfer4FinalCount infers the type of sum agg which is rewritten from final count agg run on MPP mode.
+func (a *baseFuncDesc) TypeInfer4FinalCount(finalCountRetType *types.FieldType) {
+	a.RetTp = finalCountRetType.Clone()
+}
+
 // typeInfer4Avg should returns a "decimal", otherwise it returns a "double".
 // Because child returns integer or decimal type.
 func (a *baseFuncDesc) typeInfer4Avg(sessionctx.Context) {
diff --git a/pkg/planner/core/casetest/enforcempp/testdata/enforce_mpp_suite_out.json b/pkg/planner/core/casetest/enforcempp/testdata/enforce_mpp_suite_out.json
index 2dc6c93121651..7dc03ab5a1154 100644
--- a/pkg/planner/core/casetest/enforcempp/testdata/enforce_mpp_suite_out.json
+++ b/pkg/planner/core/casetest/enforcempp/testdata/enforce_mpp_suite_out.json
@@ -681,21 +681,20 @@
           "└─ExchangeSender_79 8000.00 mpp[tiflash]  ExchangeType: PassThrough",
           "  └─Projection_10 8000.00 mpp[tiflash]  test.o.o_id, Column#6",
           "    └─Projection_78 8000.00 mpp[tiflash]  Column#6, test.o.o_id",
-          "      └─HashAgg_77 8000.00 mpp[tiflash]  group by:Column#27, funcs:sum(Column#25)->Column#6, funcs:firstrow(Column#26)->test.o.o_id",
-          "        └─Projection_81 9990.00 mpp[tiflash]  cast(Column#7, decimal(20,0) BINARY)->Column#25, Column#8->Column#26, test.o.o_id->Column#27",
-          "          └─ExchangeReceiver_73 9990.00 mpp[tiflash]  ",
-          "            └─ExchangeSender_72 9990.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.o.o_id, collate: binary]",
-          "              └─HashJoin_71 9990.00 mpp[tiflash]  inner join, equal:[eq(test.c.c_id, test.o.c_id)]",
-          "                ├─ExchangeReceiver_34(Build) 8000.00 mpp[tiflash]  ",
-          "                │ └─ExchangeSender_33 8000.00 mpp[tiflash]  ExchangeType: Broadcast, Compression: FAST",
-          "                │   └─Projection_29 8000.00 mpp[tiflash]  Column#7, Column#8, test.o.o_id, test.o.c_id",
-          "                │     └─HashAgg_30 8000.00 mpp[tiflash]  group by:test.o.c_id, test.o.o_id, funcs:sum(Column#9)->Column#7, funcs:firstrow(test.o.o_id)->Column#8, funcs:firstrow(test.o.o_id)->test.o.o_id, funcs:firstrow(test.o.c_id)->test.o.c_id",
-          "                │       └─ExchangeReceiver_32 8000.00 mpp[tiflash]  ",
-          "                │         └─ExchangeSender_31 8000.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.o.o_id, collate: binary], [name: test.o.c_id, collate: binary]",
-          "                │           └─HashAgg_21 8000.00 mpp[tiflash]  group by:test.o.c_id, test.o.o_id, funcs:count(1)->Column#9",
-          "                │             └─TableFullScan_28 10000.00 mpp[tiflash] table:o keep order:false, stats:pseudo",
-          "                └─Selection_19(Probe) 9990.00 mpp[tiflash]  not(isnull(test.c.c_id))",
-          "                  └─TableFullScan_18 10000.00 mpp[tiflash] table:c pushed down filter:empty, keep order:false, stats:pseudo"
+          "      └─HashAgg_77 8000.00 mpp[tiflash]  group by:test.o.o_id, funcs:sum(Column#7)->Column#6, funcs:firstrow(Column#8)->test.o.o_id",
+          "        └─ExchangeReceiver_73 9990.00 mpp[tiflash]  ",
+          "          └─ExchangeSender_72 9990.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.o.o_id, collate: binary]",
+          "            └─HashJoin_71 9990.00 mpp[tiflash]  inner join, equal:[eq(test.c.c_id, test.o.c_id)]",
+          "              ├─ExchangeReceiver_34(Build) 8000.00 mpp[tiflash]  ",
+          "              │ └─ExchangeSender_33 8000.00 mpp[tiflash]  ExchangeType: Broadcast, Compression: FAST",
+          "              │   └─Projection_29 8000.00 mpp[tiflash]  Column#7, Column#8, test.o.o_id, test.o.c_id",
+          "              │     └─HashAgg_30 8000.00 mpp[tiflash]  group by:test.o.c_id, test.o.o_id, funcs:sum(Column#9)->Column#7, funcs:firstrow(test.o.o_id)->Column#8, funcs:firstrow(test.o.o_id)->test.o.o_id, funcs:firstrow(test.o.c_id)->test.o.c_id",
+          "              │       └─ExchangeReceiver_32 8000.00 mpp[tiflash]  ",
+          "              │         └─ExchangeSender_31 8000.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.o.o_id, collate: binary], [name: test.o.c_id, collate: binary]",
+          "              │           └─HashAgg_21 8000.00 mpp[tiflash]  group by:test.o.c_id, test.o.o_id, funcs:count(1)->Column#9",
+          "              │             └─TableFullScan_28 10000.00 mpp[tiflash] table:o keep order:false, stats:pseudo",
+          "              └─Selection_19(Probe) 9990.00 mpp[tiflash]  not(isnull(test.c.c_id))",
+          "                └─TableFullScan_18 10000.00 mpp[tiflash] table:c pushed down filter:empty, keep order:false, stats:pseudo"
         ],
         "Warn": null
       },
@@ -706,21 +705,20 @@
           "└─ExchangeSender_79 8000.00 mpp[tiflash]  ExchangeType: PassThrough",
           "  └─Projection_10 8000.00 mpp[tiflash]  test.o.c_id, Column#6",
           "    └─Projection_78 8000.00 mpp[tiflash]  Column#6, test.o.c_id",
-          "      └─HashAgg_77 8000.00 mpp[tiflash]  group by:Column#23, funcs:sum(Column#21)->Column#6, funcs:firstrow(Column#22)->test.o.c_id",
-          "        └─Projection_81 9990.00 mpp[tiflash]  cast(Column#7, decimal(20,0) BINARY)->Column#21, Column#8->Column#22, test.o.c_id->Column#23",
-          "          └─ExchangeReceiver_73 9990.00 mpp[tiflash]  ",
-          "            └─ExchangeSender_72 9990.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.o.c_id, collate: binary]",
-          "              └─HashJoin_71 9990.00 mpp[tiflash]  inner join, equal:[eq(test.c.c_id, test.o.c_id)]",
-          "                ├─ExchangeReceiver_34(Build) 8000.00 mpp[tiflash]  ",
-          "                │ └─ExchangeSender_33 8000.00 mpp[tiflash]  ExchangeType: Broadcast, Compression: FAST",
-          "                │   └─Projection_29 8000.00 mpp[tiflash]  Column#7, Column#8, test.o.c_id",
-          "                │     └─HashAgg_30 8000.00 mpp[tiflash]  group by:test.o.c_id, funcs:sum(Column#9)->Column#7, funcs:firstrow(test.o.c_id)->Column#8, funcs:firstrow(test.o.c_id)->test.o.c_id",
-          "                │       └─ExchangeReceiver_32 8000.00 mpp[tiflash]  ",
-          "                │         └─ExchangeSender_31 8000.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.o.c_id, collate: binary]",
-          "                │           └─HashAgg_21 8000.00 mpp[tiflash]  group by:test.o.c_id, funcs:count(1)->Column#9",
-          "                │             └─TableFullScan_28 10000.00 mpp[tiflash] table:o keep order:false, stats:pseudo",
-          "                └─Selection_19(Probe) 9990.00 mpp[tiflash]  not(isnull(test.c.c_id))",
-          "                  └─TableFullScan_18 10000.00 mpp[tiflash] table:c pushed down filter:empty, keep order:false, stats:pseudo"
+          "      └─HashAgg_77 8000.00 mpp[tiflash]  group by:test.o.c_id, funcs:sum(Column#7)->Column#6, funcs:firstrow(Column#8)->test.o.c_id",
+          "        └─ExchangeReceiver_73 9990.00 mpp[tiflash]  ",
+          "          └─ExchangeSender_72 9990.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.o.c_id, collate: binary]",
+          "            └─HashJoin_71 9990.00 mpp[tiflash]  inner join, equal:[eq(test.c.c_id, test.o.c_id)]",
+          "              ├─ExchangeReceiver_34(Build) 8000.00 mpp[tiflash]  ",
+          "              │ └─ExchangeSender_33 8000.00 mpp[tiflash]  ExchangeType: Broadcast, Compression: FAST",
+          "              │   └─Projection_29 8000.00 mpp[tiflash]  Column#7, Column#8, test.o.c_id",
+          "              │     └─HashAgg_30 8000.00 mpp[tiflash]  group by:test.o.c_id, funcs:sum(Column#9)->Column#7, funcs:firstrow(test.o.c_id)->Column#8, funcs:firstrow(test.o.c_id)->test.o.c_id",
+          "              │       └─ExchangeReceiver_32 8000.00 mpp[tiflash]  ",
+          "              │         └─ExchangeSender_31 8000.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.o.c_id, collate: binary]",
+          "              │           └─HashAgg_21 8000.00 mpp[tiflash]  group by:test.o.c_id, funcs:count(1)->Column#9",
+          "              │             └─TableFullScan_28 10000.00 mpp[tiflash] table:o keep order:false, stats:pseudo",
+          "              └─Selection_19(Probe) 9990.00 mpp[tiflash]  not(isnull(test.c.c_id))",
+          "                └─TableFullScan_18 10000.00 mpp[tiflash] table:c pushed down filter:empty, keep order:false, stats:pseudo"
         ],
         "Warn": null
       },
@@ -733,21 +731,20 @@
           "    └─ExchangeSender 10.00 mpp[tiflash]  ExchangeType: PassThrough",
           "      └─TopN 10.00 mpp[tiflash]  Column#7, offset:0, count:10",
           "        └─Projection 16000.00 mpp[tiflash]  Column#9, Column#7",
-          "          └─HashAgg 16000.00 mpp[tiflash]  group by:Column#38, funcs:sum(Column#36)->Column#9, funcs:firstrow(Column#37)->Column#7",
-          "            └─Projection 16000.00 mpp[tiflash]  cast(Column#10, decimal(20,0) BINARY)->Column#36, Column#11->Column#37, Column#7->Column#38",
-          "              └─ExchangeReceiver 16000.00 mpp[tiflash]  ",
-          "                └─ExchangeSender 16000.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: Column#7, collate: binary]",
-          "                  └─Union 16000.00 mpp[tiflash]  ",
-          "                    ├─HashAgg 8000.00 mpp[tiflash]  group by:test.t.a, funcs:sum(Column#30)->Column#10, funcs:firstrow(test.t.a)->Column#11, funcs:firstrow(test.t.a)->Column#7",
-          "                    │ └─ExchangeReceiver 8000.00 mpp[tiflash]  ",
-          "                    │   └─ExchangeSender 8000.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.t.a, collate: binary]",
-          "                    │     └─HashAgg 8000.00 mpp[tiflash]  group by:test.t.a, funcs:count(1)->Column#30",
-          "                    │       └─TableFullScan 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo",
-          "                    └─HashAgg 8000.00 mpp[tiflash]  group by:test.t.a, funcs:sum(Column#33)->Column#10, funcs:firstrow(test.t.a)->Column#11, funcs:firstrow(test.t.a)->Column#7",
-          "                      └─ExchangeReceiver 8000.00 mpp[tiflash]  ",
-          "                        └─ExchangeSender 8000.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.t.a, collate: binary]",
-          "                          └─HashAgg 8000.00 mpp[tiflash]  group by:test.t.a, funcs:count(1)->Column#33",
-          "                            └─TableFullScan 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
+          "          └─HashAgg 16000.00 mpp[tiflash]  group by:Column#7, funcs:sum(Column#10)->Column#9, funcs:firstrow(Column#11)->Column#7",
+          "            └─ExchangeReceiver 16000.00 mpp[tiflash]  ",
+          "              └─ExchangeSender 16000.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: Column#7, collate: binary]",
+          "                └─Union 16000.00 mpp[tiflash]  ",
+          "                  ├─HashAgg 8000.00 mpp[tiflash]  group by:test.t.a, funcs:sum(Column#30)->Column#10, funcs:firstrow(test.t.a)->Column#11, funcs:firstrow(test.t.a)->Column#7",
+          "                  │ └─ExchangeReceiver 8000.00 mpp[tiflash]  ",
+          "                  │   └─ExchangeSender 8000.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.t.a, collate: binary]",
+          "                  │     └─HashAgg 8000.00 mpp[tiflash]  group by:test.t.a, funcs:count(1)->Column#30",
+          "                  │       └─TableFullScan 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo",
+          "                  └─HashAgg 8000.00 mpp[tiflash]  group by:test.t.a, funcs:sum(Column#33)->Column#10, funcs:firstrow(test.t.a)->Column#11, funcs:firstrow(test.t.a)->Column#7",
+          "                    └─ExchangeReceiver 8000.00 mpp[tiflash]  ",
+          "                      └─ExchangeSender 8000.00 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.t.a, collate: binary]",
+          "                        └─HashAgg 8000.00 mpp[tiflash]  group by:test.t.a, funcs:count(1)->Column#33",
+          "                          └─TableFullScan 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
         ],
         "Warn": null
       }
diff --git a/pkg/planner/core/exhaust_physical_plans.go b/pkg/planner/core/exhaust_physical_plans.go
index 7601111e36e5c..832c8277f445e 100644
--- a/pkg/planner/core/exhaust_physical_plans.go
+++ b/pkg/planner/core/exhaust_physical_plans.go
@@ -3244,7 +3244,9 @@ func (la *LogicalAggregation) tryToGetMppHashAggs(prop *property.PhysicalPropert
 	finalAggAdjust := func(aggFuncs []*aggregation.AggFuncDesc) {
 		for i, agg := range aggFuncs {
 			if agg.Mode == aggregation.FinalMode && agg.Name == ast.AggFuncCount {
+				oldFT := agg.RetTp
 				aggFuncs[i], _ = aggregation.NewAggFuncDesc(la.SCtx(), ast.AggFuncSum, agg.Args, false)
+				aggFuncs[i].TypeInfer4FinalCount(oldFT)
 			}
 		}
 	}