[Optimizer] Set Ensure for refcount on dead TExprNodes KIKIMR-24374

[denis0x0D]

Changelog entry

Mitigation for https://st.yandex-team.ru/KIKIMR-24374

Changelog category

• Bugfix

Description for reviewers

...

[github-actions]

⚪ 2025-12-05 12:52:47 UTC Pre-commit check linux-x86_64-relwithdebinfo for 9a02a3b has started.
⚪ 2025-12-05 12:53:22 UTC Artifacts will be uploaded here
⚪ 2025-12-05 12:57:28 UTC ya make is running...
🟡 2025-12-05 14:32:45 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?
38856	36178	0	6	2652	20

⚪ 2025-12-05 14:35:44 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-12-05 14:56:27 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?
705 (only retried tests)	688	0	2	1	14

⚪ 2025-12-05 14:56:37 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-12-05 15:11:47 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
536 (only retried tests)	523	0	0	0	13

🟢 2025-12-05 15:11:55 UTC Build successful.
🟢 2025-12-05 15:12:15 UTC ydbd size 2.3 GiB changed* by +832 Bytes, which is < 100.0 KiB vs stable-25-3-1: OK

ydbd size dash	stable-25-3-1: 80ccfbe	merge: 9a02a3b	diff	diff %
ydbd size	2 437 103 176 Bytes	2 437 104 008 Bytes	+832 Bytes	+0.000%
ydbd stripped size	521 877 800 Bytes	521 877 928 Bytes	+128 Bytes	+0.000%

^{*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]

⚪ 2025-12-05 12:53:28 UTC Pre-commit check linux-x86_64-release-asan for 9a02a3b has started.
⚪ 2025-12-05 12:53:42 UTC Artifacts will be uploaded here
⚪ 2025-12-05 12:57:16 UTC ya make is running...
🟡 2025-12-05 15:10:43 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?
16170	15653	0	178	318	21

🟢 2025-12-05 15:11:55 UTC Build successful.
🟢 2025-12-05 15:12:28 UTC ydbd size 3.8 GiB changed* by +1.5 KiB, which is < 100.0 KiB vs stable-25-3-1: OK

ydbd size dash	stable-25-3-1: 80ccfbe	merge: 9a02a3b	diff	diff %
ydbd size	4 055 128 528 Bytes	4 055 130 064 Bytes	+1.5 KiB	+0.000%
ydbd stripped size	1 511 174 528 Bytes	1 511 175 040 Bytes	+512 Bytes	+0.000%

^{*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]

🟢 2025-12-05 12:53:45 UTC The validation of the Pull Request description is successful.