Fix duplicated time in result set bug

[JackieTien97]

To replay you can use the following sqls (remember to disable cross_space_compaction)

create database db;
use db;
create table table1(id1 tag, s1 string);
insert into table1 values(0, 'd1', null), (1,'d1', 1);
flush;
insert into table1 values(0, 'd1', 0);
flush;
select * from table1;

previously, you will get duplicate timestamp 0

+-----------------------------+---+----+
|                         time|id1|  s1|
+-----------------------------+---+----+
|1970-01-01T08:00:00.000+08:00| d1|   0|
|1970-01-01T08:00:00.000+08:00| d1|null|
|1970-01-01T08:00:00.001+08:00| d1|   1|
+-----------------------------+---+----+

[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud