[fix](exchange) Fix debug string

[Gabriel39]

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.
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?

[Gabriel39]

run buildall

[doris-robot]

TPC-H: Total hot run time: 31836 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpch-tools
Tpch sf100 test result on commit d23fb38969e6457ecc6d75e7ed17615aa2651131, data reload: false

------ Round 1 ----------------------------------
q1	17631	4237	4049	4049
q2	2112	353	248	248
q3	10096	1251	697	697
q4	10202	784	313	313
q5	7529	2087	1821	1821
q6	194	173	145	145
q7	937	808	646	646
q8	9262	1410	1072	1072
q9	4872	4525	4571	4525
q10	6779	1801	1427	1427
q11	502	290	289	289
q12	706	760	597	597
q13	17774	3858	3093	3093
q14	290	297	273	273
q15	581	507	504	504
q16	682	693	652	652
q17	674	804	527	527
q18	6535	6489	6891	6489
q19	1252	1072	640	640
q20	460	396	250	250
q21	3211	2549	2532	2532
q22	1148	1115	1047	1047
Total cold run time: 103429 ms
Total hot run time: 31836 ms

----- Round 2, with runtime_filter_mode=off -----
q1	4333	4270	4320	4270
q2	330	407	306	306
q3	2334	2793	2373	2373
q4	1438	1947	1380	1380
q5	4534	4406	4272	4272
q6	215	164	130	130
q7	2019	1988	1709	1709
q8	2515	2282	2429	2282
q9	7185	7080	7053	7053
q10	2509	2665	2268	2268
q11	528	478	450	450
q12	717	760	656	656
q13	3613	3903	3080	3080
q14	282	299	256	256
q15	515	484	483	483
q16	600	657	605	605
q17	1111	1450	1321	1321
q18	7474	7158	7287	7158
q19	812	792	816	792
q20	1888	1937	1780	1780
q21	4487	4280	4130	4130
q22	1060	1013	975	975
Total cold run time: 50499 ms
Total hot run time: 47729 ms

[doris-robot]

TPC-DS: Total hot run time: 171738 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 d23fb38969e6457ecc6d75e7ed17615aa2651131, data reload: false

query5	4741	581	451	451
query6	336	221	207	207
query7	4225	449	261	261
query8	347	233	233	233
query9	8795	2614	2610	2610
query10	525	391	312	312
query11	15229	15337	14807	14807
query12	174	111	110	110
query13	1253	468	370	370
query14	6283	2983	2700	2700
query14_1	2649	2636	2671	2636
query15	201	196	174	174
query16	1019	491	448	448
query17	1095	692	580	580
query18	2472	435	346	346
query19	230	233	209	209
query20	125	118	117	117
query21	219	139	125	125
query22	3912	3953	3920	3920
query23	15967	15539	15197	15197
query23_1	15355	15505	15508	15505
query24	7333	1535	1156	1156
query24_1	1202	1166	1167	1166
query25	556	472	422	422
query26	1245	270	167	167
query27	2758	455	294	294
query28	4546	2127	2128	2127
query29	791	549	462	462
query30	311	230	216	216
query31	801	642	548	548
query32	80	71	66	66
query33	547	351	291	291
query34	898	890	517	517
query35	725	784	682	682
query36	853	847	802	802
query37	142	98	84	84
query38	2718	2761	2590	2590
query39	789	755	746	746
query39_1	725	740	703	703
query40	221	137	119	119
query41	70	69	68	68
query42	104	103	102	102
query43	433	474	403	403
query44	1349	724	719	719
query45	188	187	182	182
query46	857	965	596	596
query47	1426	1417	1438	1417
query48	317	323	249	249
query49	629	421	365	365
query50	650	283	223	223
query51	3797	3705	3770	3705
query52	110	112	100	100
query53	296	334	273	273
query54	299	307	248	248
query55	78	71	68	68
query56	302	307	290	290
query57	1029	1016	879	879
query58	268	259	245	245
query59	2170	2126	2151	2126
query60	318	310	295	295
query61	167	159	157	157
query62	381	351	335	335
query63	295	267	278	267
query64	4950	1312	986	986
query65	3847	3669	3738	3669
query66	1446	419	314	314
query67	15382	14885	14454	14454
query68	5942	1002	710	710
query69	499	348	307	307
query70	984	977	900	900
query71	369	299	278	278
query72	6055	3333	3455	3333
query73	754	710	296	296
query74	8761	8761	8608	8608
query75	2839	2803	2438	2438
query76	3915	1065	629	629
query77	523	387	272	272
query78	9714	9861	9129	9129
query79	1360	908	575	575
query80	658	577	479	479
query81	508	259	230	230
query82	213	141	109	109
query83	273	252	234	234
query84	255	122	108	108
query85	887	531	449	449
query86	350	296	300	296
query87	2909	2857	2756	2756
query88	3212	2210	2194	2194
query89	387	354	329	329
query90	1968	157	154	154
query91	169	168	148	148
query92	68	69	64	64
query93	1089	914	526	526
query94	558	306	259	259
query95	572	377	305	305
query96	575	459	200	200
query97	2322	2373	2344	2344
query98	232	201	200	200
query99	589	566	505	505
Total cold run time: 252188 ms
Total hot run time: 171738 ms

[github-actions]

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

[github-actions]

PR approved by anyone and no changes requested.

[hello-stephen]

skip check_coverage