[SPARK-55502][PYTHON] Unify UDF and UDTF Arrow conversion error handling#54398

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Yicong-Huang wants to merge 2 commits intoapache:masterfrom

Yicong-Huang:SPARK-55502/refactor/eliminate-is-udtf-flag

Commits on Feb 20, 2026

refactor(python): unify UDF/UDTF error handling by removing is_udtf flag
Yicong-Huang
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test(python): strengthen conversion error message assertions
Yicong-Huang
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