diff --git a/executor/join_test.go b/executor/join_test.go
index bfd0048a63b3d..a5ca48e7b1976 100644
--- a/executor/join_test.go
+++ b/executor/join_test.go
@@ -2592,3 +2592,20 @@ func (s *testSuiteJoinSerial) TestIssue20219(c *C) {
 	tk.MustQuery("select /*+ inl_join(s)*/ t.a from t left join s on t.a = s.a;").Check(testkit.Rows("i", "j"))
 	tk.MustQuery("show warnings").Check(testkit.Rows())
 }
+
+func (s *testSuiteJoinSerial) TestIssue25902(c *C) {
+	tk := testkit.NewTestKitWithInit(c, s.store)
+	tk.MustExec("drop table if exists tt1,tt2,tt3; ")
+	tk.MustExec("create table tt1 (ts timestamp);")
+	tk.MustExec("create table tt2 (ts varchar(32));")
+	tk.MustExec("create table tt3 (ts datetime);")
+	tk.MustExec("insert into tt1 values (\"2001-01-01 00:00:00\");")
+	tk.MustExec("insert into tt2 values (\"2001-01-01 00:00:00\");")
+	tk.MustExec("insert into tt3 values (\"2001-01-01 00:00:00\");")
+	tk.MustQuery("select * from tt1 where ts in (select ts from tt2);").Check(testkit.Rows("2001-01-01 00:00:00"))
+	tk.MustQuery("select * from tt1 where ts in (select ts from tt3);").Check(testkit.Rows("2001-01-01 00:00:00"))
+	tk.MustExec("set @tmp=(select @@session.time_zone);")
+	tk.MustExec("set @@session.time_zone = '+10:00';")
+	tk.MustQuery("select * from tt1 where ts in (select ts from tt2);").Check(testkit.Rows())
+	tk.MustExec("set @@session.time_zone = @tmp;")
+}
diff --git a/util/codec/codec.go b/util/codec/codec.go
index a73f1ec88544d..2f9ce666ed643 100644
--- a/util/codec/codec.go
+++ b/util/codec/codec.go
@@ -330,14 +330,7 @@ func encodeHashChunkRowIdx(sc *stmtctx.StatementContext, row chunk.Row, tp *type
 	case mysql.TypeDate, mysql.TypeDatetime, mysql.TypeTimestamp:
 		flag = uintFlag
 		t := row.GetTime(idx)
-		// Encoding timestamp need to consider timezone.
-		// If it's not in UTC, transform to UTC first.
-		if t.Type() == mysql.TypeTimestamp && sc.TimeZone != time.UTC {
-			err = t.ConvertTimeZone(sc.TimeZone, time.UTC)
-			if err != nil {
-				return
-			}
-		}
+
 		var v uint64
 		v, err = t.ToPackedUint()
 		if err != nil {
@@ -507,14 +500,7 @@ func HashChunkSelected(sc *stmtctx.StatementContext, h []hash.Hash64, chk *chunk
 				isNull[i] = !ignoreNull
 			} else {
 				buf[0] = uintFlag
-				// Encoding timestamp need to consider timezone.
-				// If it's not in UTC, transform to UTC first.
-				if t.Type() == mysql.TypeTimestamp && sc.TimeZone != time.UTC {
-					err = t.ConvertTimeZone(sc.TimeZone, time.UTC)
-					if err != nil {
-						return
-					}
-				}
+
 				var v uint64
 				v, err = t.ToPackedUint()
 				if err != nil {