[NEW RBO] Support wide lambdas for aggregation

[denis0x0D]

Changelog entry

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Changelog category

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Description for reviewers

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[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

[github-actions]

🟢 2026-01-06 14:23:21 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2026-01-06 14:25:04 UTC Pre-commit check linux-x86_64-release-asan for aa5ba8d has started.
⚪ 2026-01-06 14:25:22 UTC Artifacts will be uploaded here
⚪ 2026-01-06 14:27:34 UTC ya make is running...
🟡 2026-01-06 15:44:58 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
13888	13709	0	128	29	22

🟢 2026-01-06 15:45:08 UTC Build successful.
🟡 2026-01-06 15:45:38 UTC ydbd size 3.8 GiB changed* by +297.0 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 2e01180	merge: aa5ba8d	diff	diff %
ydbd size	4 104 521 256 Bytes	4 104 825 360 Bytes	+297.0 KiB	+0.007%
ydbd stripped size	1 535 430 224 Bytes	1 535 550 384 Bytes	+117.3 KiB	+0.008%

^{*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]

⚪ 2026-01-06 14:26:35 UTC Pre-commit check linux-x86_64-relwithdebinfo for aa5ba8d has started.
⚪ 2026-01-06 14:26:53 UTC Artifacts will be uploaded here
⚪ 2026-01-06 14:29:07 UTC ya make is running...
🟡 2026-01-06 16:14:05 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?
42990	39779	0	7	3173	31

⚪ 2026-01-06 16:14:28 UTC ya make is running... (failed tests rerun, try 2)
🟢 2026-01-06 16:20:47 UTC Tests successful.

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
654 (only retried tests)	642	0	0	0	12

🟢 2026-01-06 16:20:55 UTC Build successful.
🟡 2026-01-06 16:21:19 UTC ydbd size 2.3 GiB changed* by +143.8 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 2e01180	merge: aa5ba8d	diff	diff %
ydbd size	2 495 943 264 Bytes	2 496 090 464 Bytes	+143.8 KiB	+0.006%
ydbd stripped size	530 658 048 Bytes	530 697 920 Bytes	+38.9 KiB	+0.008%

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

[ydbot]

Backport

To backport this PR, click the button next to the target branch and then click "Run workflow" in the Run Actions UI.

Branch	Run
stable-25-3, stable-25-3-1, stable-25-4
stable-25-4