admin: fix admin check table false alarm in the case that index conta…

…ins pkIsHandle column (#7317)

executor/executor_test.go

@@ -246,6 +246,11 @@ func (s *testSuite) TestAdmin(c *C) {
 	// For "checksum_with_index", we have two checksums, so the result will be 1^1 = 0.
 	// For "checksum_without_index", we only have one checksum, so the result will be 1.
 	res.Sort().Check(testkit.Rows("test checksum_with_index 0 2 2", "test checksum_without_index 1 1 1"))
+
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(a bigint unsigned primary key, b int, c int, index idx(a, b));")
+	tk.MustExec("insert into t values(1, 1, 1)")
+	tk.MustExec("admin check table t")
 }
 
 func (s *testSuite) fillData(tk *testkit.TestKit, table string) {

util/admin/admin.go

@@ -628,7 +628,11 @@ func iterRecords(sessCtx sessionctx.Context, retriever kv.Retriever, t table.Tab
 		data := make([]types.Datum, 0, len(cols))
 		for _, col := range cols {
 			if col.IsPKHandleColumn(t.Meta()) {
-				data = append(data, types.NewIntDatum(handle))
+				if mysql.HasUnsignedFlag(col.Flag) {
+					data = append(data, types.NewUintDatum(uint64(handle)))
+				} else {
+					data = append(data, types.NewIntDatum(handle))
+				}
 			} else {
 				data = append(data, rowMap[col.ID])
 			}