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README.md
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## 📝 Schema notes
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* Every Parquet chunk contains the **union** of all JSON fields observed so far.
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* Missing columns for a given record are stored as `NULL`.
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* Top‑level JSON objects from the dump are flattened; nested structures are preserved as JSON‑encoded strings.
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* The raw JSON produced by OpenLibrary loosely follows per‑entity schemata maintained in the [`openlibrary‑client` repo](https://github.com/internetarchive/openlibrary-client/tree/master/olclient/schemata):
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## 📝 Schema notes
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* Missing columns for a given record are stored as `NULL`.
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* Top‑level JSON objects from the dump are flattened; nested structures are preserved as JSON‑encoded strings.
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* The raw JSON produced by OpenLibrary loosely follows per‑entity schemata maintained in the [`openlibrary‑client` repo](https://github.com/internetarchive/openlibrary-client/tree/master/olclient/schemata):
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