YQ-4900 fixed empty streaming queries sys view without user token

[GrigoriyPA]

Changelog entry

Fixed empty streaming queries sys view without user token

Changelog category

• Bugfix

Description for reviewers

Bugfix ticket: https://st.yandex-team.ru/YQ-4900

[github-actions]

🟢 2025-11-18 14:36:27 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-11-18 14:36:50 UTC Pre-commit check linux-x86_64-relwithdebinfo for 8905037 has started.
⚪ 2025-11-18 14:37:57 UTC Artifacts will be uploaded here
⚪ 2025-11-18 14:39:58 UTC ya make is running...
🟡 2025-11-18 16:08:24 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
39027	36153	0	2	2842	30

⚪ 2025-11-18 16:08:36 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-11-18 16:23:05 UTC Tests successful.

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
70 (only retried tests)	56	0	0	0	14

🟢 2025-11-18 16:23:12 UTC Build successful.
🟢 2025-11-18 16:23:31 UTC ydbd size 2.3 GiB changed* by +1.2 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: c7db72b	merge: 8905037	diff	diff %
ydbd size	2 445 947 336 Bytes	2 445 948 568 Bytes	+1.2 KiB	+0.000%
ydbd stripped size	520 050 968 Bytes	520 051 160 Bytes	+192 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]

⚪ 2025-11-18 14:37:32 UTC Pre-commit check linux-x86_64-release-asan for 8905037 has started.
⚪ 2025-11-18 14:37:51 UTC Artifacts will be uploaded here
⚪ 2025-11-18 14:40:03 UTC ya make is running...
🟡 2025-11-18 15:55:36 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?
12700	12564	0	113	7	16

🟢 2025-11-18 15:55:45 UTC Build successful.
🟢 2025-11-18 15:56:11 UTC ydbd size 3.8 GiB changed* by +1.6 KiB, which is < 100.0 KiB vs main: OK

ydbd size dash	main: c7db72b	merge: 8905037	diff	diff %
ydbd size	4 094 976 264 Bytes	4 094 977 864 Bytes	+1.6 KiB	+0.000%
ydbd stripped size	1 520 315 056 Bytes	1 520 315 376 Bytes	+320 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}

[Copilot]

Pull Request Overview

This PR fixes a bug where streaming queries system view would be empty when accessed without a user token. The fix adds a null/empty check before assigning the UserToken to avoid issues with empty tokens.

Key Changes:

• Added conditional check for UserToken validity before assignment in streaming queries schema describe actor
• Added test case to verify streaming queries system view works without authentication

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
ydb/core/sys_view/streaming_queries/streaming_queries.cpp	Adds check for UserToken and GetSanitizedToken() before assigning to request to prevent empty token issues
ydb/core/kqp/ut/federated_query/datastreams/datastreams_ut.cpp	Adds test case "ReadWithoutAuth" to verify system view works without authentication

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