25-1-4-e: Bug fixes in changefeed exports

[stanislav-shchetinin]

Changelog entry

#25454 and #25524

Changelog category

• Bugfix

Description for reviewers

Cherry-picks from #25536 and #25528

[github-actions]

🟢 2025-12-24 08:44:26 UTC The validation of the Pull Request description is successful.

[ydbot]

Run Extra Tests

Run additional tests for this PR. You can customize:

• Test Size: small, medium, large (default: all)
• Test Targets: any directory path (default: ydb/)
• Sanitizers: ASAN, MSAN, TSAN
• Coredumps: enable for debugging (default: off)
• Additional args: custom ya make arguments

[CyberROFL]

@stanislav-shchetinin тесты упали.

[github-actions]

⚪ 2025-12-28 08:46:06 UTC Pre-commit check linux-x86_64-relwithdebinfo for f428eaf has started.
⚪ 2025-12-28 08:46:22 UTC Artifacts will be uploaded here
⚪ 2025-12-28 08:49:26 UTC ya make is running...
🟡 2025-12-28 10:00:46 UTC Some tests failed, follow the links below. Going to retry failed tests...

Details

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
27070	25787	0	12	1228	43

⚪ 2025-12-28 10:01:14 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-12-28 10:22:06 UTC Some tests failed, follow the links below. Going to retry failed tests...

Details

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
101 (only retried tests)	57	0	1	7	36

⚪ 2025-12-28 10:22:09 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-12-28 10:42:38 UTC Tests successful.

Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
69 (only retried tests)	27	0	0	7	35

🟢 2025-12-28 10:42:41 UTC Build successful.
🟢 2025-12-28 10:43:02 UTC ydbd size 2.2 GiB changed* by -156.2 MiB, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 10b439a	merge: f428eaf	diff	diff %
ydbd size	2 491 192 160 Bytes	2 327 392 320 Bytes	-156.2 MiB	-6.575%
ydbd stripped size	529 941 760 Bytes	487 712 800 Bytes	-40.3 MiB	-7.969%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2025-12-28 08:47:49 UTC Pre-commit check linux-x86_64-release-asan for f428eaf has started.
⚪ 2025-12-28 08:48:03 UTC Artifacts will be uploaded here
⚪ 2025-12-28 08:51:00 UTC ya make is running...
🟡 2025-12-28 10:08:56 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Details

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12885	12723	0	28	95	39

⚪ 2025-12-28 10:09:03 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-12-28 10:34:01 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Details

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
202 (only retried tests)	164	0	1	0	37

⚪ 2025-12-28 10:34:04 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-12-28 10:53:41 UTC Tests successful.

Ya make output | Test bloat | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
65 (only retried tests)	29	0	0	0	36

🟢 2025-12-28 10:53:43 UTC Build successful.
🟢 2025-12-28 10:54:17 UTC ydbd size 3.8 GiB changed* by -43.5 MiB, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 10b439a	merge: f428eaf	diff	diff %
ydbd size	4 095 671 616 Bytes	4 050 058 600 Bytes	-43.5 MiB	-1.114%
ydbd stripped size	1 533 037 600 Bytes	1 410 535 576 Bytes	-116.8 MiB	-7.991%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[zinal]

lgtm