fix(polling_source): eliminate per-batch schema inference, fix zero-row crash (ENG-952) - #261

Merged

eywalker merged 10 commits into

mainfrom

eywalker/eng-952-fix-upstream-pollingsource-dies-when-a-poll-returns-a-zero

Aug 28, 2026

Commits on Aug 28, 2026

docs(specs): add ENG-952 design spec for PollingSource zero-row batch fix
kurodo3[bot]
committed
aa4d164
docs(specs): update ENG-952 spec — canonical-schema approach replaces Fix B
kurodo3[bot]
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b3edf06
docs(plans): add ENG-952 implementation plan
kurodo3[bot]
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ea073d6
test(polling_source): add failing regression tests for ENG-952 zero-row batch crash
kurodo3[bot]
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cd28140
refactor(test_polling_source): remove extraneous to_config/from_config from inline test impls
kurodo3[bot]
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eea06fd
fix(polling_source): establish canonical Arrow schema once, eliminating zero-row crash
kurodo3[bot]
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780285e
fix(polling_source): defer infer-once schema establishment until first non-empty batch
kurodo3[bot]
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9203b02
docs(design_issues): add PS4 entry for ENG-952 zero-row batch schema crash
kurodo3[bot]
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3f7d747
docs(polling_source): improve _build_stream_from_df docstring and remove stale type: ignore
kurodo3[bot]
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7f4cdaa
fix(test_polling_source): update test_zero_row_batch_is_not_accumulated for _batches API
kurodo3[bot]
committed
1eb1d43