#9056 Complete column names in YDB CLI

[vityaman]

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Description for reviewers

Complete column names in YDB CLI

Implemented DescribeTable using the YDB Client. Now supported only SELECT a| FROM table_name. SELECT | FROM table_name is not working because of current limitations of the completion engine (it interprets FROM as a column name and then fails to parse a table name after from), so at least one letter of column name is required. Also SELECT p.a| FROM table_name AS p is working.

• Related to YQL-19747
• Related to Auto complete in YDB CLI (in interactive mode) #9056

[github-actions]

Hi! Thank you for contributing!
The tests on this PR will run after a maintainer adds an ok-to-test label to this PR manually. Thank you for your patience!

[github-actions]

🟢 2025-06-26 18:44:16 UTC The validation of the Pull Request description is successful.

[vityaman]

@pnv1, the PR is ready for a review.

[github-actions]

⚪ 2025-06-26 20:37:32 UTC Pre-commit check linux-x86_64-release-asan for 00a15c5 has started.
⚪ 2025-06-26 20:37:45 UTC Artifacts will be uploaded here
⚪ 2025-06-26 20:40:12 UTC ya make is running...
🟡 2025-06-26 21:20:09 UTC Some tests failed, follow the links below. This fail is not in blocking policy yet

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
1376	1247	0	13	110	6

🟢 2025-06-26 21:20:24 UTC Build successful.
🟢 2025-06-26 21:20:40 UTC ydbd size 3.9 GiB changed* by -96 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 935b735	merge: 00a15c5	diff	diff %
ydbd size	4 193 756 216 Bytes	4 193 756 120 Bytes	-96 Bytes	-0.000%
ydbd stripped size	1 453 748 792 Bytes	1 453 748 728 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}

[github-actions]

⚪ 2025-06-26 20:38:32 UTC Pre-commit check linux-x86_64-relwithdebinfo for 00a15c5 has started.
⚪ 2025-06-26 20:38:46 UTC Artifacts will be uploaded here
⚪ 2025-06-26 20:41:21 UTC ya make is running...
🟢 2025-06-26 20:58:55 UTC Tests successful.

Test history | Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
2156	2143	0	0	9	4

🟢 2025-06-26 20:59:12 UTC Build successful.
🟢 2025-06-26 20:59:23 UTC ydbd size 2.2 GiB changed* by 0 Bytes, which is <= 0 Bytes vs main: OK

ydbd size dash	main: 935b735	merge: 00a15c5	diff	diff %
ydbd size	2 383 680 216 Bytes	2 383 680 216 Bytes	0 Bytes	0.000%
ydbd stripped size	499 053 288 Bytes	499 053 288 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}