[OLAP Projection pushdown] Do not push projection if kqp expects a full json document from CS

[denis0x0D]

Changelog entry

Fix for #26437

Changelog category

• Bugfix

Description for reviewers

...

[github-actions]

🟢 2025-10-30 16:08:59 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-10-30 16:07:23 UTC Pre-commit check linux-x86_64-release-asan for 3eace84 has started.
⚪ 2025-10-30 16:07:37 UTC Artifacts will be uploaded here
⚪ 2025-10-30 16:11:09 UTC ya make is running...
🟡 2025-10-30 18:14:46 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?
15405	14877	0	203	304	21

🟢 2025-10-30 18:16:00 UTC Build successful.
🟢 2025-10-30 18:16:24 UTC ydbd size 3.8 GiB changed* by +45.7 KiB, which is < 100.0 KiB vs stable-25-3-1: OK

ydbd size dash	stable-25-3-1: 5867487	merge: 3eace84	diff	diff %
ydbd size	4 052 559 504 Bytes	4 052 606 272 Bytes	+45.7 KiB	+0.001%
ydbd stripped size	1 510 382 080 Bytes	1 510 399 168 Bytes	+16.7 KiB	+0.001%

^{*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]

⚪ 2025-10-30 16:07:41 UTC Pre-commit check linux-x86_64-relwithdebinfo for 3eace84 has started.
⚪ 2025-10-30 16:07:57 UTC Artifacts will be uploaded here
⚪ 2025-10-30 16:11:26 UTC ya make is running...
🟡 2025-10-30 17:42:31 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
37772	35102	0	3	2650	17

⚪ 2025-10-30 17:45:38 UTC ya make is running... (failed tests rerun, try 2)
🟡 2025-10-30 18:09:52 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
536 (only retried tests)	521	0	1	0	14

⚪ 2025-10-30 18:10:02 UTC ya make is running... (failed tests rerun, try 3)
🟢 2025-10-30 18:23:41 UTC Tests successful.

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

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
526 (only retried tests)	511	0	0	0	15

🟢 2025-10-30 18:23:49 UTC Build successful.
🟢 2025-10-30 18:24:05 UTC ydbd size 2.3 GiB changed* by +14.8 KiB, which is < 100.0 KiB vs stable-25-3-1: OK

ydbd size dash	stable-25-3-1: 5867487	merge: 3eace84	diff	diff %
ydbd size	2 435 453 376 Bytes	2 435 468 480 Bytes	+14.8 KiB	+0.001%
ydbd stripped size	521 559 560 Bytes	521 563 016 Bytes	+3.4 KiB	+0.001%

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