[WIP] Json subcolumns store change from string to binary

[Vladilen]

Changelog entry

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Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

...

[github-actions]

⚪ 2025-10-27 11:08:31 UTC Pre-commit check linux-x86_64-relwithdebinfo for 4699bf6 has started.
⚪ 2025-10-27 11:09:03 UTC Artifacts will be uploaded here
⚪ 2025-10-27 11:11:13 UTC ya make is running...
🔴 2025-10-27 12:52:51 UTC Too many tests failed, NOT going to retry
🔴 2025-10-27 13:13:22 UTC Some tests failed, follow the links below.

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
39170	32441	0	3891	2808	30

🟢 2025-10-27 13:13:33 UTC Build successful.
🟡 2025-10-27 13:13:50 UTC ydbd size 2.3 GiB changed* by +113.2 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: db27fa0	merge: 4699bf6	diff	diff %
ydbd size	2 436 880 096 Bytes	2 436 995 992 Bytes	+113.2 KiB	+0.005%
ydbd stripped size	518 034 952 Bytes	518 067 784 Bytes	+32.1 KiB	+0.006%

^{*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]

🟢 2025-10-27 11:10:47 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-10-27 11:11:22 UTC Pre-commit check linux-x86_64-release-asan for 4699bf6 has started.
⚪ 2025-10-27 11:11:37 UTC Artifacts will be uploaded here
⚪ 2025-10-27 11:13:03 UTC ya make is running...
🟡 2025-10-27 13:44:24 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?
15629	15096	0	246	270	17

🟢 2025-10-27 13:44:31 UTC Build successful.
🟡 2025-10-27 13:44:53 UTC ydbd size 3.8 GiB changed* by +190.5 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: db27fa0	merge: 4699bf6	diff	diff %
ydbd size	4 055 022 024 Bytes	4 055 217 112 Bytes	+190.5 KiB	+0.005%
ydbd stripped size	1 505 755 840 Bytes	1 505 834 208 Bytes	+76.5 KiB	+0.005%

^{*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]

⚪ 2025-10-28 10:51:31 UTC Pre-commit check linux-x86_64-release-asan for 1a0cc95 has started.
⚪ 2025-10-28 10:51:47 UTC Artifacts will be uploaded here
⚪ 2025-10-28 10:53:10 UTC ya make is running...
⚫ 2025-10-28 11:36:36 UTC Check cancelled

[github-actions]

⚪ 2025-10-28 10:52:48 UTC Pre-commit check linux-x86_64-relwithdebinfo for 1a0cc95 has started.
⚪ 2025-10-28 10:53:07 UTC Artifacts will be uploaded here
⚪ 2025-10-28 10:54:37 UTC ya make is running...
⚫ 2025-10-28 11:36:42 UTC Check cancelled

[github-actions]

⚪ 2025-10-28 11:39:59 UTC Pre-commit check linux-x86_64-relwithdebinfo for 208583e has started.
⚪ 2025-10-28 11:40:15 UTC Artifacts will be uploaded here
⚪ 2025-10-28 11:41:40 UTC ya make is running...
⚫ 2025-10-28 11:49:33 UTC Check cancelled

[github-actions]

⚪ 2025-10-28 11:52:22 UTC Pre-commit check linux-x86_64-relwithdebinfo for 4d0f5ae has started.
⚪ 2025-10-28 11:52:26 UTC Artifacts will be uploaded here
⚪ 2025-10-28 11:53:56 UTC ya make is running...
🔴 2025-10-28 13:38:41 UTC Too many tests failed, NOT going to retry
🔴 2025-10-28 14:10:24 UTC Some tests failed, follow the links below.

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
39212	32511	0	3884	2792	25

🟢 2025-10-28 14:10:36 UTC Build successful.
🟢 2025-10-28 14:10:52 UTC ydbd size 2.3 GiB changed* by -25.7 KiB, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 744e230	merge: 4d0f5ae	diff	diff %
ydbd size	2 427 340 304 Bytes	2 427 313 944 Bytes	-25.7 KiB	-0.001%
ydbd stripped size	517 566 664 Bytes	517 550 856 Bytes	-15.4 KiB	-0.003%

^{*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]

⚪ 2025-10-28 11:59:53 UTC Pre-commit check linux-x86_64-release-asan for 4d0f5ae has started.
⚪ 2025-10-28 12:00:12 UTC Artifacts will be uploaded here
⚪ 2025-10-28 12:01:41 UTC ya make is running...
🟡 2025-10-28 14:19:32 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?
15639	15109	0	236	277	17

🟢 2025-10-28 14:19:39 UTC Build successful.
🟢 2025-10-28 14:20:03 UTC ydbd size 3.8 GiB changed* by -50.0 KiB, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 744e230	merge: 4d0f5ae	diff	diff %
ydbd size	4 062 762 152 Bytes	4 062 710 976 Bytes	-50.0 KiB	-0.001%
ydbd stripped size	1 509 476 248 Bytes	1 509 444 696 Bytes	-30.8 KiB	-0.002%

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