Dropped index_auto_choose_mode flag from local-ydb config with env YDB_EXPERIMENTAL_PG=1

[asmyasnikov]

Changelog entry

Related issue: #26022

Changelog category

• Bugfix

Description for reviewers

...

[github-actions]

🟢 2025-09-30 20:18:41 UTC The validation of the Pull Request description is successful.

[Copilot]

Pull Request Overview

This PR removes the index_auto_choose_mode configuration setting from the local YDB test configuration when the PostgreSQL compatibility experiment is enabled. The change simplifies the test setup by removing what appears to be an experimental configuration flag.

• Removes index_auto_choose_mode = 'max_used_prefix' from table service config
• Maintains other PostgreSQL compatibility settings (AST cache, temp tables, PG types, PG syntax)

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[github-actions]

⚪ 2025-09-30 20:07:01 UTC Pre-commit check linux-x86_64-relwithdebinfo for a27f9a6 has started.
⚪ 2025-09-30 20:08:17 UTC Artifacts will be uploaded here
⚪ 2025-09-30 20:11:44 UTC ya make is running...
⚫ 2025-09-30 20:16:09 UTC Check cancelled

[github-actions]

⚪ 2025-09-30 20:07:54 UTC Pre-commit check linux-x86_64-release-asan for a27f9a6 has started.
⚪ 2025-09-30 20:08:07 UTC Artifacts will be uploaded here
⚪ 2025-09-30 20:10:59 UTC ya make is running...
⚫ 2025-09-30 20:16:10 UTC Check cancelled

[github-actions]

⚪ 2025-09-30 20:16:50 UTC Pre-commit check linux-x86_64-relwithdebinfo for a27f9a6 has started.
⚪ 2025-09-30 20:17:04 UTC Artifacts will be uploaded here
⚪ 2025-09-30 20:20:14 UTC ya make is running...
🟡 2025-09-30 20:59:41 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
6974	6831	0	2	130	11

⚪ 2025-09-30 20:59:46 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-09-30 21:08:26 UTC Tests successful.

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
47 (only retried tests)	37	0	0	0	10

🟢 2025-09-30 21:08:29 UTC Build successful.
🟢 2025-09-30 21:08:42 UTC ydbd size 2.2 GiB changed* by 0 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 57f0b05	merge: a27f9a6	diff	diff %
ydbd size	2 397 779 880 Bytes	2 397 779 880 Bytes	0 Bytes	0.000%
ydbd stripped size	512 649 384 Bytes	512 649 384 Bytes	0 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]

⚪ 2025-09-30 20:20:28 UTC Pre-commit check linux-x86_64-release-asan for a27f9a6 has started.
⚪ 2025-09-30 20:20:43 UTC Artifacts will be uploaded here
⚪ 2025-09-30 20:23:32 UTC ya make is running...
🟡 2025-09-30 21:34:38 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?
3108	2859	0	61	180	8

🟢 2025-09-30 21:34:43 UTC Build successful.
🟢 2025-09-30 21:35:03 UTC ydbd size 3.7 GiB changed* by -96 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 57f0b05	merge: a27f9a6	diff	diff %
ydbd size	3 988 033 712 Bytes	3 988 033 616 Bytes	-96 Bytes	-0.000%
ydbd stripped size	1 486 466 560 Bytes	1 486 466 496 Bytes	-64 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}