[fix](pipelineX) fix nullptr in loca exchange dependency

[Mryange]

Proposed changes

Issue Number: close #xxx

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...

[Mryange]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[doris-robot]

(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 43.86 seconds
stream load tsv: 569 seconds loaded 74807831229 Bytes, about 125 MB/s
stream load json: 18 seconds loaded 2358488459 Bytes, about 124 MB/s
stream load orc: 66 seconds loaded 1101869774 Bytes, about 15 MB/s
stream load parquet: 32 seconds loaded 861443392 Bytes, about 25 MB/s
insert into select: 28.8 seconds inserted 10000000 Rows, about 347K ops/s
storage size: 17098800118 Bytes

[doris-robot]

TPC-H test result on machine: 'aliyun_ecs.c7a.8xlarge_32C64G'

Tpch sf100 test result on commit ba574c5798c66f708fa5b3cca4e7fae533054bac, data reload: false

run tpch-sf100 query with default conf and session variables
q1	4932	4656	4638	4638
q2	377	140	136	136
q3	2084	1927	1901	1901
q4	1478	1313	1344	1313
q5	4049	4046	4125	4046
q6	276	129	128	128
q7	1476	874	881	874
q8	2947	2946	2932	2932
q9	9901	9796	9584	9584
q10	3487	3562	3590	3562
q11	400	248	251	248
q12	460	285	290	285
q13	4656	3786	3791	3786
q14	324	282	290	282
q15	586	535	520	520
q16	674	576	588	576
q17	1202	999	1029	999
q18	7833	7426	7424	7424
q19	1780	1766	1762	1762
q20	586	297	283	283
q21	4568	4089	4086	4086
q22	480	380	369	369
Total cold run time: 54556 ms
Total hot run time: 49734 ms

run tpch-sf100 query with default conf and set session variable runtime_filter_mode=off
q1	4642	4584	4627	4584
q2	348	223	249	223
q3	4031	4000	4002	4000
q4	2741	2735	2747	2735
q5	9596	9603	9617	9603
q6	272	122	119	119
q7	3021	2473	2497	2473
q8	4399	4437	4401	4401
q9	13022	12914	12837	12837
q10	4054	4195	4218	4195
q11	790	654	666	654
q12	1001	803	814	803
q13	4427	3568	3561	3561
q14	377	344	342	342
q15	579	528	510	510
q16	731	667	667	667
q17	3893	3904	3920	3904
q18	9520	9095	9092	9092
q19	1943	1912	1903	1903
q20	2399	2092	2053	2053
q21	8903	8700	8698	8698
q22	920	840	827	827
Total cold run time: 81609 ms
Total hot run time: 78184 ms

[doris-robot]

TeamCity be ut coverage result:
Function Coverage: 36.58% (8449/23098)
Line Coverage: 28.86% (68672/237929)
Region Coverage: 27.83% (35515/127608)
Branch Coverage: 24.57% (18121/73760)
Coverage Report: http://coverage.selectdb-in.cc/coverage/ba574c5798c66f708fa5b3cca4e7fae533054bac_ba574c5798c66f708fa5b3cca4e7fae533054bac/report/index.html

[github-actions]

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

[github-actions]

PR approved by anyone and no changes requested.