feat: add DataFrame fill_nan#22702

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apache:mainfrom

Nagato-Yuzuru:issue/14770

Commits on Jun 1, 2026

Commits on Jun 2, 2026

refactor: extract shared logic for filling columns into `fill_columns` helper
Nagato-Yuzuru
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test: update fill_nan tests to use `strip_backtrace` for improved error matching
Nagato-Yuzuru
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test: add test for fill_nan with cross-type casting of fill value
Nagato-Yuzuru
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Commits on Jun 3, 2026

refacot: change fill_nan signature to &[&str]
Nagato-Yuzuru
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Commits on Jun 4, 2026