Fix arrow tests

[dahbka-lis]

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[github-actions]

🟢 2026-03-03 11:18:09 UTC The validation of the Pull Request description is successful.

[github-actions]

⚪ 2026-03-03 11:19:27 UTC Pre-commit check linux-x86_64-release-asan for 52aab04 has started.
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Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
70	70	0	0	0	0

🟢 2026-03-03 11:48:47 UTC Build successful.

[Copilot]

Pull request overview

This PR adjusts Arrow-format unit tests in kqp_result_set_formats_ut.cpp to stop failing when a deserialized Arrow RecordBatch contains 0 rows.

Changes:

• Removed assertions requiring RecordBatch::num_rows() > 0 in several Arrow streaming/schema-inclusion tests.
• Removed an assertion requiring non-empty row count in the Arrow compression comparison helper.

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[github-actions]

⚪ 2026-03-03 11:27:17 UTC Pre-commit check linux-x86_64-relwithdebinfo for 52aab04 has started.
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⚪ 2026-03-03 11:29:56 UTC ya make is running...
🟢 2026-03-03 11:41:32 UTC Tests successful.

Ya make output | Test bloat

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
70	70	0	0	0	0

🟢 2026-03-03 11:41:35 UTC Build successful.

[ydbot]

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Branch	Run
stable-25-4, stable-25-4-1, stable-26-1, stable-26-1-1
stable-26-1, stable-26-1-1
stable-26-1