# sniff_csv — DuckDB 1.5.5

No description supplied by the engine.

- Reference: /products/haybarn/functions/releases/duckdb-1.5.5/sniff_csv/
- JSON: /products/haybarn/functions/api/v1/duckdb-1.5.5/functions/sniff_csv.json
- Snapshot ID: duckdb-1.5.5
- Engine: duckdb v1.5.5
- Source ID: d8cdaa33fd
- Binary SHA-256: 8463eb26527b278109cfddffc4606e1019ebefcfe2eac75efc53c76ed8f282d5
- Captured: 2026-09-05T18:37:40.699Z
- Source: https://github.com/duckdb/duckdb/releases/tag/v1.5.5
- Loaded extensions: autocomplete, core_functions, icu, json, parquet, shell

## Interpretation

- Choose a snapshot matching the target engine and build. The default is captured from the published Haybarn WASM package used by the browser playground. Historical native snapshots are also available.
- Availability is an observation in the recorded build and extension profile, not a guarantee of support in every installation or in WASM.
- Types and descriptions are declarations from duckdb_functions(). Binding can specialize result types. Null means not supplied by the catalog; do not invent defaults, optionality, argument mode, or table output columns.
- Raw parameter arrays preserve catalog order for scalar/aggregate/macro functions. Raw table arguments are alphabetical. Use callingConvention for engine-confirmed positional order and named arguments; null modes are unrecorded. Named does not mean optional. Macro defaults and special named variadic behavior are not supplied by duckdb_functions().
- Catalog examples are source material and may require data or extensions. runnableExamples contains separately verified SQL for the pinned WASM package; sample-data adaptations and guide examples are labeled separately.
- Guide annotations and recipes are separate editorial content. The browser runner always uses Haybarn WASM 1.5.5-rc3, independently of the documentation snapshot.
- All URLs beginning with / are relative to the origin hosting this document. Exports require no JavaScript, cookies, API key, or browser engine.

## Overloads

### overload-8f7d448e5ceccbca

Kind: table. Parameter order: alphabetical-not-call-order.

```text
sniff_csv(col0: VARCHAR, all_varchar := BOOLEAN, allow_quoted_nulls := BOOLEAN, auto_detect := BOOLEAN, auto_type_candidates := ANY, buffer_size := UBIGINT, column_names := VARCHAR[], column_types := ANY, columns := ANY, comment := VARCHAR, compression := VARCHAR, dateformat := VARCHAR, decimal_separator := VARCHAR, delim := VARCHAR, dtypes := ANY, encoding := VARCHAR, escape := VARCHAR, filename := ANY, files_to_sniff := BIGINT, force_match := BOOLEAN, force_not_null := VARCHAR[], header := BOOLEAN, hive_partitioning := BOOLEAN, hive_types := ANY, hive_types_autocast := BOOLEAN, ignore_errors := BOOLEAN, max_line_size := VARCHAR, maximum_line_size := VARCHAR, names := VARCHAR[], new_line := VARCHAR, normalize_names := BOOLEAN, null_padding := BOOLEAN, nullstr := ANY, parallel := BOOLEAN, quote := VARCHAR, rejects_limit := BIGINT, rejects_scan := VARCHAR, rejects_table := VARCHAR, sample_size := BIGINT, sep := VARCHAR, skip := BIGINT, store_rejects := BOOLEAN, strict_mode := BOOLEAN, thousands := VARCHAR, timestampformat := VARCHAR, types := ANY, union_by_name := BOOLEAN) → TABLE
```

Link: /products/haybarn/functions/releases/duckdb-1.5.5/sniff_csv/#overload-8f7d448e5ceccbca

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| all_varchar | BOOLEAN | named |
| allow_quoted_nulls | BOOLEAN | named |
| auto_detect | BOOLEAN | named |
| auto_type_candidates | ANY | named |
| buffer_size | UBIGINT | named |
| col0 | VARCHAR | positional (position 1) |
| column_names | VARCHAR[] | named |
| column_types | ANY | named |
| columns | ANY | named |
| comment | VARCHAR | named |
| compression | VARCHAR | named |
| dateformat | VARCHAR | named |
| decimal_separator | VARCHAR | named |
| delim | VARCHAR | named |
| dtypes | ANY | named |
| encoding | VARCHAR | named |
| escape | VARCHAR | named |
| filename | ANY | named |
| files_to_sniff | BIGINT | named |
| force_match | BOOLEAN | named |
| force_not_null | VARCHAR[] | named |
| header | BOOLEAN | named |
| hive_partitioning | BOOLEAN | named |
| hive_types | ANY | named |
| hive_types_autocast | BOOLEAN | named |
| ignore_errors | BOOLEAN | named |
| max_line_size | VARCHAR | named |
| maximum_line_size | VARCHAR | named |
| names | VARCHAR[] | named |
| new_line | VARCHAR | named |
| normalize_names | BOOLEAN | named |
| null_padding | BOOLEAN | named |
| nullstr | ANY | named |
| parallel | BOOLEAN | named |
| quote | VARCHAR | named |
| rejects_limit | BIGINT | named |
| rejects_scan | VARCHAR | named |
| rejects_table | VARCHAR | named |
| sample_size | BIGINT | named |
| sep | VARCHAR | named |
| skip | BIGINT | named |
| store_rejects | BOOLEAN | named |
| strict_mode | BOOLEAN | named |
| thousands | VARCHAR | named |
| timestampformat | VARCHAR | named |
| types | ANY | named |
| union_by_name | BOOLEAN | named |

Declared return type: unknown. Variadic argument type: none declared.
Stability: unknown. Declared side effects: unknown.


## Guide recipes

No guide recipes.

## Engine catalog examples

Source examples may require additional data or extensions. Expressions are wrapped in SELECT; execution verification is not recorded.

No catalog examples.

## Additional DuckDB documentation

- [CSV Import](https://duckdb.org/docs/current/data/csv/overview)
- [CSV Auto Detection](https://duckdb.org/docs/current/data/csv/auto_detection#sniff_csv-function)

## Observed availability

| Snapshot | Observed | Overloads | JSON |
| --- | --- | --- | --- |
| haybarn-1.5.5-rc3 | present | 1 | [reference](/products/haybarn/functions/api/v1/haybarn-1.5.5-rc3/functions/sniff_csv.json) |
| duckdb-1.5.5 | present | 1 | [reference](/products/haybarn/functions/api/v1/duckdb-1.5.5/functions/sniff_csv.json) |
| duckdb-1.4.4 | present | 1 | [reference](/products/haybarn/functions/api/v1/duckdb-1.4.4/functions/sniff_csv.json) |
| duckdb-1.3.2 | present | 1 | [reference](/products/haybarn/functions/api/v1/duckdb-1.3.2/functions/sniff_csv.json) |

Engine catalog documentation is derived from MIT-licensed Haybarn and DuckDB. [Notices](/third-party-notices.txt).