branch-4.1: [fix](be) Fix release build warning in column mapper #65143

[github-actions]

What problem does this PR solve?

Issue Number: None

Related PRs: #65046, #65143, #65559

Problem Summary:

PR #65559 backported the FileScannerV2 series, including #65046, to branch-4.1, but did not include the follow-up Release compilation fix#65143. With NDEBUG, the diagnostic uses of the two caught exceptions are compiled out, so clang reports -Werror,-Wunused-exception-parameter while compiling be/src/format_v2/column_mapper.cpp.

This PR marks both catch parameters as [[maybe_unused]]. Debug diagnostics and Release fallback behavior are unchanged.

Cherry-picked from #65143.

Release note

None.

Check List (For Author)

• Test
  • Regression test
  • Unit Test
  • Manual test
    • TeamCity Doris Compile build 1001872 passed on current head be72438f77af633fdd9d5d84b11e30a9b8202bd1.
  • No need to test or manual test.
• Behavior changed:
  • No.
  • Yes.
• Does this need documentation?
  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[hello-stephen]

Thank you for your contribution to Apache Doris.
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Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[hello-stephen]

run buildall

[shuke987]

/review

[github-actions]

Codex automated review failed and did not complete.

Error: You've hit your usage limit. Visit https://chatgpt.com/codex/settings/usage to purchase more credits or try again at Jul 25th, 2026 6:03 AM.
Workflow run: https://github.com/apache/doris/actions/runs/29818229314

Please inspect the workflow logs and rerun the review after the underlying issue is resolved.

[hello-stephen]

BE Regression && UT Coverage Report

Increment line coverage 50.00% (1/2) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	72.93% (28591/39204)
Line Coverage	56.35% (309226/548725)
Region Coverage	53.31% (257010/482148)
Branch Coverage	54.43% (113209/207979)

[hello-stephen]

skip buildall

[hello-stephen]

流水线已跑过了，昨天卡在license check , rebase后直接skip all