[Opt](performance) refactor and opt time round floor function

[HappenLee]

Proposed changes

Before：

 [testdb]>select hour_floor(`@timestamp`, 4) as t, count() as cnt from httplogs_date group by t order by t limit 10;
+---------------------+--------+
| t                   | cnt    |
+---------------------+--------+
| 1998-05-01 00:00:00 |    324 |
| 1998-05-01 04:00:00 | 174137 |
| 1998-05-01 08:00:00 | 140461 |
| 1998-05-01 12:00:00 | 145945 |
| 1998-05-01 16:00:00 | 213248 |
| 1998-05-01 20:00:00 | 293426 |
| 1998-05-02 00:00:00 | 226038 |
| 1998-05-02 04:00:00 | 119502 |
| 1998-05-02 08:00:00 | 101933 |
| 1998-05-02 12:00:00 |  95275 |
+---------------------+--------+
10 rows in set (2.97 sec)

after:

 [testdb]>select hour_floor(`@timestamp`, 4) as t, count() as cnt from httplogs_date group by t order by t limit 10;
+---------------------+--------+
| t                   | cnt    |
+---------------------+--------+
| 1998-05-01 00:00:00 |    324 |
| 1998-05-01 04:00:00 | 174137 |
| 1998-05-01 08:00:00 | 140461 |
| 1998-05-01 12:00:00 | 145945 |
| 1998-05-01 16:00:00 | 213248 |
| 1998-05-01 20:00:00 | 293426 |
| 1998-05-02 00:00:00 | 226038 |
| 1998-05-02 04:00:00 | 119502 |
| 1998-05-02 08:00:00 | 101933 |
| 1998-05-02 12:00:00 |  95275 |
+---------------------+--------+
10 rows in set (0.67 sec)

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[HappenLee]

run buildall

[github-actions]

clang-tidy made some suggestions

[github-actions]

warning: variable 'diff' is not initialized [cppcoreguidelines-init-variables]

Suggested change

	int64_t diff;
	int64_t diff = 0;

[github-actions]

warning: variable 'part' is not initialized [cppcoreguidelines-init-variables]

Suggested change

	int64_t part;
	int64_t part = 0;

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.29% (8145/22442)
Line Coverage: 28.44% (65172/229180)
Region Coverage: 27.38% (33754/123293)
Branch Coverage: 24.04% (17214/71602)
Coverage Report: http://coverage.selectdb-in.cc/coverage/05a31933a3c7548db20cc221ddf3c6e93551faec_05a31933a3c7548db20cc221ddf3c6e93551faec/report/index.html

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 46.52 seconds
stream load tsv: 577 seconds loaded 74807831229 Bytes, about 123 MB/s
stream load json: 21 seconds loaded 2358488459 Bytes, about 107 MB/s
stream load orc: 64 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 31 seconds loaded 861443392 Bytes, about 26 MB/s
insert into select: 28.9 seconds inserted 10000000 Rows, about 346K ops/s
storage size: 17162537501 Bytes

[HappenLee]

run buildall

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.29% (8145/22442)
Line Coverage: 28.43% (65166/229178)
Region Coverage: 27.37% (33746/123293)
Branch Coverage: 24.04% (17215/71602)
Coverage Report: http://coverage.selectdb-in.cc/coverage/8a0f4bc7dc9cc0266c85323a95335c5fcc9e0d4e_8a0f4bc7dc9cc0266c85323a95335c5fcc9e0d4e/report/index.html

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 46 seconds
stream load tsv: 579 seconds loaded 74807831229 Bytes, about 123 MB/s
stream load json: 21 seconds loaded 2358488459 Bytes, about 107 MB/s
stream load orc: 64 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 32 seconds loaded 861443392 Bytes, about 25 MB/s
insert into select: 28.9 seconds inserted 10000000 Rows, about 346K ops/s
storage size: 17162193710 Bytes

[airborne12]

LGTM

[github-actions]

PR approved by anyone and no changes requested.

[github-actions]

PR approved by at least one committer and no changes requested.