[Bug](exec) Fix min max push agg error read char column

[HappenLee]

What problem does this PR solve?

mysql> set disable_nereids_rules='';
Query OK, 0 rows affected (0.00 sec)

mysql> select length(min(b)) from t;
+----------------+
| length(min(b)) |
+----------------+
|             10 |
+----------------+
1 row in set (0.01 sec)

mysql> set disable_nereids_rules=ELIMINATE_NOT_NULL;
Query OK, 0 rows affected (0.01 sec)

mysql> select length(min(b)) from t;
+----------------+
| length(min(b)) |
+----------------+
|              3 |
+----------------+
1 row in set (0.02 sec)

Problem Summary:

Release note

None

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[hello-stephen]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR.

Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[HappenLee]

run buildall

[github-actions]

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

[github-actions]

PR approved by anyone and no changes requested.

[doris-robot]

BE UT Coverage Report

Increment line coverage 0.00% (0/13) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	52.72% (19264/36541)
Line Coverage	36.11% (179040/495772)
Region Coverage	32.53% (138721/426383)
Branch Coverage	33.49% (60067/179345)

[doris-robot]

TPC-H: Total hot run time: 32080 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpch-tools
Tpch sf100 test result on commit 4bdebd09ac106e08fe66207ff6af9c9f80bbde89, data reload: false

------ Round 1 ----------------------------------
q1	17692	5294	5090	5090
q2	2058	325	185	185
q3	10196	1337	764	764
q4	10303	847	322	322
q5	8611	2148	1935	1935
q6	218	182	147	147
q7	860	744	616	616
q8	9273	1400	1122	1122
q9	5467	4840	4825	4825
q10	6860	1946	1546	1546
q11	518	300	275	275
q12	379	376	222	222
q13	17775	4052	3199	3199
q14	237	234	216	216
q15	928	811	833	811
q16	671	663	624	624
q17	800	774	511	511
q18	7611	6622	6691	6622
q19	1458	987	635	635
q20	379	339	221	221
q21	2659	2053	1914	1914
q22	351	317	278	278
Total cold run time: 105304 ms
Total hot run time: 32080 ms

----- Round 2, with runtime_filter_mode=off -----
q1	5450	5287	5325	5287
q2	250	352	246	246
q3	2169	2684	2283	2283
q4	1365	1745	1317	1317
q5	4295	4215	4586	4215
q6	253	202	154	154
q7	2084	2042	1759	1759
q8	2698	2484	2424	2424
q9	7582	7533	7502	7502
q10	2912	2996	2643	2643
q11	571	528	446	446
q12	656	743	621	621
q13	3953	4300	3738	3738
q14	299	317	285	285
q15	872	836	860	836
q16	688	737	675	675
q17	1229	1455	1446	1446
q18	8262	7913	8122	7913
q19	846	834	834	834
q20	2153	2158	1993	1993
q21	5163	4329	4044	4044
q22	567	589	522	522
Total cold run time: 54317 ms
Total hot run time: 51183 ms

[doris-robot]

ClickBench: Total hot run time: 28.28 s

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/clickbench-tools
ClickBench test result on commit 4bdebd09ac106e08fe66207ff6af9c9f80bbde89, data reload: false

query1	0.05	0.04	0.05
query2	0.10	0.04	0.04
query3	0.25	0.08	0.08
query4	1.61	0.11	0.11
query5	0.26	0.25	0.25
query6	1.17	0.68	0.67
query7	0.03	0.03	0.02
query8	0.05	0.04	0.04
query9	0.57	0.50	0.49
query10	0.55	0.53	0.54
query11	0.14	0.09	0.10
query12	0.14	0.10	0.10
query13	0.63	0.62	0.63
query14	1.06	1.03	1.05
query15	0.88	0.85	0.86
query16	0.39	0.37	0.39
query17	1.11	1.11	1.07
query18	0.22	0.21	0.21
query19	2.08	2.03	1.93
query20	0.02	0.02	0.01
query21	15.42	0.27	0.15
query22	5.06	0.06	0.05
query23	15.83	0.28	0.10
query24	2.40	0.36	0.41
query25	0.11	0.09	0.10
query26	0.14	0.13	0.13
query27	0.06	0.09	0.06
query28	5.02	1.15	0.97
query29	12.58	3.94	3.18
query30	0.28	0.13	0.11
query31	2.81	0.62	0.41
query32	3.24	0.59	0.50
query33	3.26	3.22	3.25
query34	15.92	5.41	4.74
query35	4.81	4.78	4.93
query36	0.65	0.50	0.49
query37	0.10	0.06	0.06
query38	0.08	0.04	0.04
query39	0.04	0.03	0.03
query40	0.18	0.17	0.16
query41	0.08	0.03	0.03
query42	0.04	0.03	0.03
query43	0.05	0.04	0.04
Total cold run time: 99.47 s
Total hot run time: 28.28 s

[hello-stephen]

BE Regression && UT Coverage Report

Increment line coverage 100.00% (13/13) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	73.17% (26210/35819)
Line Coverage	56.26% (278222/494539)
Region Coverage	53.93% (232265/430701)
Branch Coverage	55.67% (100234/180061)

[HappenLee]

run buildall

[doris-robot]

TPC-H: Total hot run time: 32437 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpch-tools
Tpch sf100 test result on commit 247647a15a3653d263d3d390c8ad342227152a40, data reload: false

------ Round 1 ----------------------------------
q1	17659	5332	5097	5097
q2	2053	321	206	206
q3	10190	1354	774	774
q4	10208	892	325	325
q5	7540	2249	1926	1926
q6	200	177	152	152
q7	917	745	607	607
q8	9266	1439	1127	1127
q9	5517	4874	4859	4859
q10	6854	1956	1567	1567
q11	543	302	268	268
q12	392	380	225	225
q13	17784	4153	3308	3308
q14	233	243	219	219
q15	907	831	808	808
q16	669	709	627	627
q17	651	794	526	526
q18	6988	6512	7600	6512
q19	1116	1057	679	679
q20	422	403	231	231
q21	3082	2328	2103	2103
q22	368	322	291	291
Total cold run time: 103559 ms
Total hot run time: 32437 ms

----- Round 2, with runtime_filter_mode=off -----
q1	5637	6309	5541	5541
q2	278	342	279	279
q3	2337	2921	2410	2410
q4	1456	1904	1505	1505
q5	4671	4637	4625	4625
q6	232	180	144	144
q7	2047	2234	1772	1772
q8	2589	2422	2443	2422
q9	7611	7438	7369	7369
q10	2957	2982	2588	2588
q11	535	465	451	451
q12	715	758	609	609
q13	3948	4443	3522	3522
q14	302	305	264	264
q15	840	802	796	796
q16	637	675	648	648
q17	1096	1240	1306	1240
q18	7432	7297	7259	7259
q19	884	865	879	865
q20	1969	2067	1878	1878
q21	4515	4281	4117	4117
q22	565	571	494	494
Total cold run time: 53253 ms
Total hot run time: 50798 ms

[doris-robot]

ClickBench: Total hot run time: 28.48 s

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/clickbench-tools
ClickBench test result on commit 247647a15a3653d263d3d390c8ad342227152a40, data reload: false

query1	0.05	0.04	0.04
query2	0.10	0.05	0.05
query3	0.26	0.08	0.08
query4	1.61	0.11	0.11
query5	0.26	0.27	0.27
query6	1.16	0.67	0.69
query7	0.03	0.04	0.02
query8	0.05	0.03	0.04
query9	0.56	0.50	0.49
query10	0.54	0.55	0.55
query11	0.14	0.10	0.09
query12	0.13	0.11	0.10
query13	0.63	0.61	0.62
query14	1.08	1.05	1.08
query15	0.87	0.86	0.89
query16	0.42	0.42	0.39
query17	1.10	1.12	1.14
query18	0.24	0.22	0.22
query19	2.09	2.01	2.04
query20	0.02	0.02	0.01
query21	15.40	0.27	0.14
query22	5.24	0.05	0.04
query23	16.02	0.28	0.11
query24	0.95	0.53	0.39
query25	0.12	0.06	0.08
query26	0.14	0.14	0.13
query27	0.09	0.06	0.07
query28	3.96	1.14	0.97
query29	12.58	3.92	3.15
query30	0.28	0.13	0.12
query31	2.82	0.63	0.41
query32	3.23	0.60	0.50
query33	3.19	3.28	3.25
query34	16.09	5.37	4.72
query35	4.76	4.80	4.84
query36	0.66	0.51	0.48
query37	0.10	0.06	0.06
query38	0.08	0.04	0.04
query39	0.04	0.03	0.04
query40	0.18	0.17	0.15
query41	0.08	0.04	0.03
query42	0.05	0.03	0.03
query43	0.05	0.04	0.04
Total cold run time: 97.45 s
Total hot run time: 28.48 s

[hello-stephen]

BE UT Coverage Report

Increment line coverage 0.00% (0/13) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	52.49% (19272/36717)
Line Coverage	35.97% (179073/497794)
Region Coverage	32.40% (138959/428839)
Branch Coverage	33.33% (60088/180279)

[hello-stephen]

BE Regression && UT Coverage Report

Increment line coverage 100.00% (13/13) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	71.53% (25746/35992)
Line Coverage	54.22% (269255/496617)
Region Coverage	52.00% (225274/433249)
Branch Coverage	53.22% (96334/181011)