fix: correct null_count aggregation in boolean statistics collection

[YinZheng-Sun]

The get_boolean_statistics function was incorrectly breaking early when both true and false values were found in the first array, causing subsequent arrays' null counts to be skipped. This resulted in incorrect null_count values when processing multiple batches.

[Xuanwo]

Thank you for working on this and sorry for missing this PR.

Can you fix clippy and format? This PR is almost ready to go.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[YinZheng-Sun]

Thank you for working on this and sorry for missing this PR.

Can you fix clippy and format? This PR is almost ready to go.

done @Xuanwo

[github-actions]

Code Review

Summary: This PR fixes a bug where null_count was incorrectly calculated for boolean statistics when multiple arrays were processed. The fix is correct and well-tested.

Assessment: ✅ Approve

The bug fix is straightforward and correct:

• Before: The break statement exited the loop entirely once both true and false were found, skipping null count accumulation for remaining arrays
• After: Using continue allows the loop to process all arrays for null count while skipping the expensive value iteration when min/max are already determined

The test case properly validates the fix by checking that null counts are correctly aggregated across multiple arrays.

No issues identified.