Ensure that ScanActor receives from CS correct column count

[Hor911]

#15845

[github-actions]

⚪ 2025-03-18 12:57:27 UTC Pre-commit check linux-x86_64-relwithdebinfo for c52e1e8 has started.
⚪ 2025-03-18 12:57:31 UTC Artifacts will be uploaded here
⚪ 2025-03-18 13:00:16 UTC ya make is running...
🟡 2025-03-18 14:17:57 UTC Some tests failed, follow the links below. Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
19544	18180	0	4	1241	119

⚪ 2025-03-18 14:19:51 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-03-18 14:35:37 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
187 (only retried tests)	74	0	0	2	111

🟢 2025-03-18 14:35:44 UTC Build successful.
🟡 2025-03-18 14:36:04 UTC ydbd size 2.1 GiB changed* by +653.0 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 3adb5dc	merge: c52e1e8	diff	diff %
ydbd size	2 299 419 352 Bytes	2 300 088 064 Bytes	+653.0 KiB	+0.029%
ydbd stripped size	481 264 512 Bytes	481 400 832 Bytes	+133.1 KiB	+0.028%

^{*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]

🟢 2025-03-18 12:57:42 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-03-18 13:00:19 UTC Pre-commit check linux-x86_64-release-asan for c52e1e8 has started.
⚪ 2025-03-18 13:00:34 UTC Artifacts will be uploaded here
⚪ 2025-03-18 13:03:22 UTC ya make is running...
🟡 2025-03-18 14:33:19 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet Going to retry failed tests...

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
12047	11948	0	46	16	37

⚪ 2025-03-18 14:34:25 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-03-18 14:53:14 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
150 (only retried tests)	104	0	0	12	34

🟢 2025-03-18 14:53:28 UTC Build successful.
🟡 2025-03-18 14:54:00 UTC ydbd size 3.8 GiB changed* by +1.2 MiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: 3adb5dc	merge: c52e1e8	diff	diff %
ydbd size	4 048 600 960 Bytes	4 049 844 248 Bytes	+1.2 MiB	+0.031%
ydbd stripped size	1 400 545 448 Bytes	1 401 009 928 Bytes	+453.6 KiB	+0.033%

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