[fix](decimalv2) fix scale of decimalv2 to string (#35222)

[jacktengg]

Proposed changes

Pick #35222

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...

[doris-robot]

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[jacktengg]

run buildall

[doris-robot]

TPC-H: Total hot run time: 50197 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpch-tools
Tpch sf100 test result on commit bfb740aa6064c3d4e853bf5bf21638118c442050, data reload: false

------ Round 1 ----------------------------------
q1	17548	4415	4410	4410
q2	2067	154	152	152
q3	10265	1919	1970	1919
q4	10285	1305	1348	1305
q5	8642	3929	3920	3920
q6	241	125	121	121
q7	2039	1602	1612	1602
q8	9355	2758	2745	2745
q9	10922	11021	10497	10497
q10	8669	3544	3586	3544
q11	430	235	252	235
q12	473	300	302	300
q13	18369	3958	4018	3958
q14	353	328	320	320
q15	511	461	466	461
q16	679	572	571	571
q17	1155	985	974	974
q18	7350	6816	6891	6816
q19	1716	1611	1516	1516
q20	539	321	306	306
q21	4432	4206	4125	4125
q22	494	406	400	400
Total cold run time: 116534 ms
Total hot run time: 50197 ms

----- Round 2, with runtime_filter_mode=off -----
q1	4336	4377	4326	4326
q2	329	226	226	226
q3	4228	4186	4157	4157
q4	2763	2777	2771	2771
q5	7175	7050	7061	7050
q6	239	124	117	117
q7	3289	2828	2847	2828
q8	4418	4560	4532	4532
q9	16919	16837	16751	16751
q10	4227	4289	4299	4289
q11	771	704	709	704
q12	1023	863	846	846
q13	7522	3788	3769	3769
q14	458	424	432	424
q15	513	465	451	451
q16	752	709	699	699
q17	3896	3879	3891	3879
q18	8807	8887	8816	8816
q19	1735	1720	1683	1683
q20	2386	2161	2093	2093
q21	8589	8483	8567	8483
q22	1018	922	936	922
Total cold run time: 85393 ms
Total hot run time: 79816 ms

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 37.79% (8078/21376)
Line Coverage: 29.44% (65951/224003)
Region Coverage: 28.93% (33990/117474)
Branch Coverage: 24.80% (17453/70380)
Coverage Report: http://coverage.selectdb-in.cc/coverage/bfb740aa6064c3d4e853bf5bf21638118c442050_bfb740aa6064c3d4e853bf5bf21638118c442050/report/index.html

[doris-robot]

TPC-DS: Total hot run time: 205880 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 bfb740aa6064c3d4e853bf5bf21638118c442050, data reload: false

query1	921	389	375	375
query2	6521	2831	2679	2679
query3	6923	213	207	207
query4	20255	17876	17979	17876
query5	19729	6580	6510	6510
query6	282	222	235	222
query7	4160	302	315	302
query8	257	253	232	232
query9	3139	2677	2641	2641
query10	425	294	299	294
query11	11483	10798	10720	10720
query12	124	76	80	76
query13	5600	671	661	661
query14	17830	13539	13509	13509
query15	368	226	220	220
query16	6480	273	255	255
query17	1570	1468	882	882
query18	2279	407	403	403
query19	213	152	156	152
query20	79	75	84	75
query21	193	103	90	90
query22	5135	5035	5034	5034
query23	32671	32172	32002	32002
query24	7062	6485	6459	6459
query25	508	415	422	415
query26	526	162	159	159
query27	1916	291	299	291
query28	6184	2381	2343	2343
query29	2868	2925	2678	2678
query30	239	167	169	167
query31	920	769	745	745
query32	77	63	59	59
query33	401	250	243	243
query34	841	482	505	482
query35	1127	941	903	903
query36	1300	1196	1119	1119
query37	91	60	60	60
query38	3136	2931	2920	2920
query39	1386	1340	1329	1329
query40	204	95	90	90
query41	38	36	35	35
query42	80	84	79	79
query43	779	717	692	692
query44	1147	721	723	721
query45	244	239	234	234
query46	1222	964	983	964
query47	1793	1638	1778	1638
query48	1020	734	713	713
query49	634	372	364	364
query50	872	580	595	580
query51	4722	4710	4657	4657
query52	97	85	91	85
query53	442	324	319	319
query54	2690	2489	2454	2454
query55	90	82	88	82
query56	218	200	213	200
query57	1134	1147	1291	1147
query58	211	200	203	200
query59	4343	4048	4102	4048
query60	219	197	206	197
query61	89	88	90	88
query62	819	468	594	468
query63	482	335	353	335
query64	2590	1485	1457	1457
query65	3611	3565	3588	3565
query66	789	373	378	373
query67	17093	17356	15800	15800
query68	8618	693	654	654
query69	552	323	338	323
query70	1596	1622	1324	1324
query71	395	311	324	311
query72	6498	3449	3413	3413
query73	737	329	332	329
query74	6335	5920	5820	5820
query75	5160	3763	3680	3680
query76	5130	1136	1151	1136
query77	868	262	262	262
query78	12743	13360	13408	13360
query79	9749	673	664	664
query80	706	396	393	393
query81	496	232	231	231
query82	260	96	102	96
query83	164	137	130	130
query84	260	71	69	69
query85	784	304	301	301
query86	349	312	296	296
query87	3326	3029	2996	2996
query88	4710	2376	2375	2375
query89	368	323	343	323
query90	1913	216	220	216
query91	166	138	149	138
query92	59	53	51	51
query93	969	582	581	581
query94	713	199	199	199
query95	1116	1087	1084	1084
query96	631	340	332	332
query97	6591	6356	6355	6355
query98	190	175	168	168
query99	2859	920	896	896
Total cold run time: 307902 ms
Total hot run time: 205880 ms

[doris-robot]

ClickBench: Total hot run time: 30.92 s

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/clickbench-tools
ClickBench test result on commit bfb740aa6064c3d4e853bf5bf21638118c442050, data reload: false

query1	0.02	0.02	0.02
query2	0.07	0.02	0.03
query3	0.24	0.04	0.04
query4	1.79	0.06	0.07
query5	0.53	0.52	0.52
query6	1.23	0.65	0.59
query7	0.01	0.01	0.01
query8	0.04	0.02	0.03
query9	0.52	0.48	0.48
query10	0.55	0.53	0.54
query11	0.11	0.09	0.09
query12	0.12	0.09	0.09
query13	0.62	0.61	0.61
query14	0.82	0.79	0.78
query15	0.78	0.75	0.77
query16	0.38	0.36	0.35
query17	0.98	1.02	1.02
query18	0.23	0.26	0.26
query19	1.92	1.85	1.79
query20	0.01	0.01	0.00
query21	15.50	0.54	0.54
query22	2.14	1.83	1.97
query23	17.21	1.00	0.92
query24	6.10	1.46	1.11
query25	0.38	0.09	0.05
query26	0.73	0.16	0.15
query27	0.04	0.04	0.04
query28	6.46	0.74	0.71
query29	12.63	2.22	2.26
query30	0.55	0.51	0.52
query31	2.81	0.38	0.37
query32	3.40	0.50	0.50
query33	3.09	3.05	3.08
query34	15.27	4.78	4.80
query35	4.86	4.84	4.83
query36	1.07	1.01	1.01
query37	0.06	0.05	0.05
query38	0.04	0.02	0.02
query39	0.02	0.02	0.01
query40	0.16	0.14	0.14
query41	0.07	0.02	0.02
query42	0.02	0.01	0.01
query43	0.02	0.02	0.02
Total cold run time: 103.6 s
Total hot run time: 30.92 s

[doris-robot]

Load test result on machine: 'aliyun_ecs.c7a.8xlarge_32C64G'

Load test result on commit bfb740aa6064c3d4e853bf5bf21638118c442050 with default session variables
Stream load json:         20 seconds loaded 2358488459 Bytes, about 112 MB/s
Stream load orc:          58 seconds loaded 1101869774 Bytes, about 18 MB/s
Stream load parquet:      31 seconds loaded 861443392 Bytes, about 26 MB/s
Insert into select:       21.5 seconds inserted 10000000 Rows, about 465K ops/s