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JSON Type 11228
DuckDB supports json via the JSON logical type. For example: SELECT '[1, null, {"key": "value"}]'::JSON; [1, null, {"key": "value"}] Logically, the JSON type is similar to a VARCHAR , but with the restriction that it must be valid JSON. Phy ... y, the data is stored as a VARCHAR . For example, you can't parse invalid JSON: SELECT 'unquoted'::JSON; Conversion Error: Malformed JSON at byte 0 of input: unexpected character. Input: "unquoted" Instead, what you probably want here is SELECT '"quoted"' ...
https://man.mtool.work/duckdb/2.0/data/json/json_type.html
CSV Auto Detection 7485
When using read_csv , the system tries to automatically infer how to read the CSV file using the CSV sniffer . This step is necessary because CSV files are not self-describing and come in many different dialects. The auto-detection works ro ... ovide and only detects the properties you did not specify. For example, passing ignore_errors = true lets the sniffer skip malformed lines while it detects the dialect. The auto_detect parameter must be true (its default) for sniff_csv ; passing auto_dete ...
https://man.mtool.work/duckdb/2.0/data/csv/auto_detection.html
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DuckDB 2.0 Documentation / man.mtool.work