[fix](mysql buffer) fix buffer overflow of output complex type columns

[jacktengg]

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

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.
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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?

[jacktengg]

run buildall

[doris-robot]

TPC-DS: Total hot run time: 190513 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpcds-tools
TPC-DS sf100 test result on commit 3ed40a3fd46a8c51905a9ffe6da604b4e387c444, data reload: false

query1	1079	441	410	410
query2	6584	1696	1705	1696
query3	6749	220	219	219
query4	26960	23727	23016	23016
query5	5085	621	477	477
query6	337	234	234	234
query7	4651	475	301	301
query8	312	261	250	250
query9	8711	2554	2546	2546
query10	546	328	303	303
query11	15687	15192	14803	14803
query12	209	117	116	116
query13	1672	548	441	441
query14	11498	9170	9123	9123
query15	206	192	174	174
query16	7673	674	490	490
query17	1168	743	612	612
query18	2048	470	357	357
query19	227	226	183	183
query20	136	152	141	141
query21	215	138	126	126
query22	4621	4730	4731	4730
query23	34573	34201	34183	34183
query24	8520	2526	2554	2526
query25	646	570	493	493
query26	1339	289	170	170
query27	2892	514	382	382
query28	5046	2236	2226	2226
query29	855	693	484	484
query30	362	237	212	212
query31	965	886	893	886
query32	103	91	71	71
query33	717	391	329	329
query34	834	857	524	524
query35	830	874	768	768
query36	1032	1113	923	923
query37	125	108	86	86
query38	3585	3539	3462	3462
query39	1480	1451	1423	1423
query40	217	127	114	114
query41	65	57	56	56
query42	118	108	106	106
query43	488	497	487	487
query44	1322	813	810	810
query45	178	179	177	177
query46	840	974	632	632
query47	1783	1820	1752	1752
query48	393	419	310	310
query49	774	508	401	401
query50	636	692	391	391
query51	4017	3914	3869	3869
query52	107	111	99	99
query53	237	263	191	191
query54	596	588	519	519
query55	90	83	87	83
query56	323	342	305	305
query57	1188	1192	1141	1141
query58	285	275	274	274
query59	2558	2603	2567	2567
query60	349	331	327	327
query61	155	151	151	151
query62	811	735	659	659
query63	228	195	191	191
query64	4410	1161	906	906
query65	4081	3969	3956	3956
query66	1064	436	338	338
query67	15570	15605	15248	15248
query68	9559	938	594	594
query69	496	320	288	288
query70	1392	1284	1254	1254
query71	518	346	334	334
query72	5944	4855	4834	4834
query73	698	579	360	360
query74	8948	9058	8973	8973
query75	4592	3387	2841	2841
query76	3855	1156	750	750
query77	1018	393	314	314
query78	9636	9834	8911	8911
query79	1864	852	590	590
query80	661	566	499	499
query81	500	265	229	229
query82	456	155	130	130
query83	297	273	249	249
query84	307	118	91	91
query85	886	454	435	435
query86	333	322	274	274
query87	3770	3792	3719	3719
query88	2943	2273	2260	2260
query89	404	319	282	282
query90	2034	228	218	218
query91	183	166	132	132
query92	87	69	67	67
query93	1149	962	644	644
query94	697	450	336	336
query95	420	320	318	318
query96	492	559	278	278
query97	2961	2993	2870	2870
query98	242	209	212	209
query99	1472	1428	1274	1274
Total cold run time: 281975 ms
Total hot run time: 190513 ms

[doris-robot]

ClickBench: Total hot run time: 30.68 s

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/clickbench-tools
ClickBench test result on commit 3ed40a3fd46a8c51905a9ffe6da604b4e387c444, data reload: false

query1	0.06	0.05	0.05
query2	0.08	0.05	0.06
query3	0.25	0.09	0.09
query4	1.61	0.12	0.12
query5	0.28	0.27	0.26
query6	1.18	0.65	0.64
query7	0.03	0.02	0.02
query8	0.06	0.04	0.05
query9	0.66	0.53	0.53
query10	0.59	0.59	0.57
query11	0.17	0.12	0.11
query12	0.14	0.12	0.12
query13	0.63	0.62	0.63
query14	1.03	1.01	1.03
query15	0.87	0.83	0.87
query16	0.41	0.42	0.39
query17	1.05	1.08	1.09
query18	0.22	0.20	0.20
query19	1.98	1.77	1.85
query20	0.01	0.01	0.02
query21	15.46	0.98	0.58
query22	0.75	1.20	0.70
query23	14.91	1.36	0.63
query24	6.98	1.46	1.07
query25	0.50	0.21	0.10
query26	0.62	0.17	0.13
query27	0.07	0.06	0.06
query28	10.17	1.35	0.94
query29	12.60	4.06	3.18
query30	0.28	0.14	0.12
query31	2.83	0.60	0.39
query32	3.26	0.58	0.48
query33	3.08	3.10	3.14
query34	16.14	5.49	4.90
query35	4.96	4.89	4.98
query36	0.70	0.51	0.52
query37	0.10	0.08	0.08
query38	0.06	0.04	0.04
query39	0.03	0.03	0.03
query40	0.17	0.16	0.15
query41	0.09	0.04	0.03
query42	0.05	0.03	0.02
query43	0.04	0.04	0.04
Total cold run time: 105.16 s
Total hot run time: 30.68 s

[doris-robot]

BE UT Coverage Report

Increment line coverage 100.00% (1/1) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	52.53% (17754/33795)
Line Coverage	37.72% (161280/427527)
Region Coverage	32.21% (123210/382500)
Branch Coverage	33.59% (54019/160795)

[jacktengg]

run p0