Copy arrow helpers for building ResultSet to KQP

[dahbka-lis]

Changelog entry

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Changelog category

• Not for changelog (changelog entry is not required)

Description for reviewers

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[Copilot]

Pull Request Overview

This PR copies arrow helpers used for building ResultSet to KQP (Kernel Query Processor). The changes focus on moving utility functions from DQ to KQP for handling arrow-based result set operations.

• Moves and refactors arrow helpers functionality from DQ runtime to KQP
• Cleans up test code by removing unused functionality
• Simplifies arrow conversion logic with a more focused approach

Reviewed Changes

Copilot reviewed 35 out of 35 changed files in this pull request and generated 4 comments.

File	Description
ydb/library/yql/dq/runtime/dq_arrow_helpers_ut.cpp	Removed arrow conversion test code and simplified basic type testing
ydb/core/kqp/common/result_set_format/*	Added new arrow helpers and result set format utilities for KQP
ydb/core/kqp/runtime/kqp_transport.cpp	Simplified by delegating to new result set builders
Multiple *.cpp and *.h files	Updated imports and type references to use new KQP arrow helpers

Comments suppressed due to low confidence (1)

ydb/library/yql/dq/runtime/dq_arrow_helpers_ut.cpp:1

• The test assertions check field types but don't verify the field values. Consider adding assertions to validate that the actual data stored in these fields is correct.

#include "dq_arrow_helpers.h"

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[github-actions]

🟢 2025-09-22 14:27:48 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2025-09-22 14:27:51 UTC Pre-commit check linux-x86_64-release-asan for 1d0b0ba has started.
⚪ 2025-09-22 14:28:06 UTC Artifacts will be uploaded here
⚪ 2025-09-22 14:31:57 UTC ya make is running...
🟡 2025-09-22 17:12:19 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?
17419	16986	0	132	271	30

🟢 2025-09-22 17:14:02 UTC Build successful.
🟡 2025-09-22 17:14:25 UTC ydbd size 3.8 GiB changed* by +461.4 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: b1b3841	merge: 1d0b0ba	diff	diff %
ydbd size	4 043 419 608 Bytes	4 043 892 048 Bytes	+461.4 KiB	+0.012%
ydbd stripped size	1 506 339 904 Bytes	1 506 525 792 Bytes	+181.5 KiB	+0.012%

^{*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]

⚪ 2025-09-22 14:29:37 UTC Pre-commit check linux-x86_64-relwithdebinfo for 1d0b0ba has started.
⚪ 2025-09-22 14:29:51 UTC Artifacts will be uploaded here
⚪ 2025-09-22 14:33:41 UTC ya make is running...
🟡 2025-09-22 16:39:28 UTC Some tests failed, follow the links below. Going to retry failed tests...

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
40317	37555	0	1	2728	33

⚪ 2025-09-22 16:43:27 UTC ya make is running... (failed tests rerun, try 2)
🟢 2025-09-22 16:56:17 UTC Tests successful.

Ya make output | Test bloat | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
263 (only retried tests)	242	0	0	0	21

🟢 2025-09-22 16:56:25 UTC Build successful.
🟡 2025-09-22 16:56:42 UTC ydbd size 2.3 GiB changed* by +207.5 KiB, which is >= 100.0 KiB vs main: Warning

ydbd size dash	main: b1b3841	merge: 1d0b0ba	diff	diff %
ydbd size	2 430 261 160 Bytes	2 430 473 632 Bytes	+207.5 KiB	+0.009%
ydbd stripped size	520 687 496 Bytes	520 731 592 Bytes	+43.1 KiB	+0.008%

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

[kunga]

tx/datashard ok