[python] Add scanners, sharding, and row kind support#7348

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tub wants to merge 12 commits intoapache:masterfrom

tub:python-streaming-1b-scanners

Commits on Mar 9, 2026

[python] Add caching infrastructure and utilities

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[python] Add scanners, sharding, and row kind support

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Making examples more generic
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[python] Reduce test boilerplate in manifest_cache_test and fix assertEquals

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[python] Address PR #7347 review feedback: use @cachedmethod, trim docs, remove ChangelogProducer

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[python] Simplify manifest cache tests: deduplicate via mixin, drop default-size tests

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[python] Fix trailing blank line in snapshot_manager.py (flake8 W391)

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[python] Downgrade cachetools to 5.x for Python 3.6 compat

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[python] Address PR #7348 review: trim verbose docstrings, consolidate tests, fix parallelism

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[python] Remove manifest/snapshot caches and dead code per review

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Revert unrelated changes to reduce PR diff

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Reverting unintentional removals
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