# decode — Haybarn WASM 1.5.5-rc3

Converts `blob` to `VARCHAR`. Invalid UTF-8 is handled based on the error behavior argument. Can be 'strict' (default, fail), 'replace' to replace invalid characters with '?', or 'ignore' to skip invalid characters.

- Reference: /products/haybarn/functions/releases/haybarn-1.5.5-rc3/decode/
- JSON: /products/haybarn/functions/api/v1/haybarn-1.5.5-rc3/functions/decode.json
- Snapshot ID: haybarn-1.5.5-rc3
- Engine: haybarn v1.5.6-dev149
- Source ID: 105edd31b5
- Binary SHA-256: 426638bc374fcc542fea93b251f885bfb7d221c68fcc0a5a81cc565d7e6ca180
- Captured: 2026-09-06T00:23:30.515Z
- Source: https://www.npmjs.com/package/@haybarn/haybarn-wasm/v/1.5.5-rc3
- Loaded extensions: core_functions, icu, json, parquet

## 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-0330ed4ce03d5209

Kind: scalar. Parameter order: catalog-order.

```text
decode(blob: BLOB) → VARCHAR
```

Link: /products/haybarn/functions/releases/haybarn-1.5.5-rc3/decode/#overload-0330ed4ce03d5209

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| blob | BLOB | not recorded |

Declared return type: VARCHAR. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-1a18436ca967a439

Kind: scalar. Parameter order: catalog-order.

```text
decode(blob: BLOB, varchar: VARCHAR) → VARCHAR
```

Link: /products/haybarn/functions/releases/haybarn-1.5.5-rc3/decode/#overload-1a18436ca967a439

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| blob | BLOB | not recorded |
| varchar | VARCHAR | not recorded |

Declared return type: VARCHAR. Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.


## 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.

Reported for: overload-0330ed4ce03d5209, overload-1a18436ca967a439

```sql
SELECT decode('\xC3\xBC'::BLOB);
```

Reported for: overload-0330ed4ce03d5209, overload-1a18436ca967a439

```sql
SELECT decode('\xA0'::BLOB, 'replace');
```

Reported for: overload-0330ed4ce03d5209, overload-1a18436ca967a439

```sql
SELECT decode('\xA0'::BLOB, 'ignore');
```

## Runnable examples

Executed successfully in Haybarn WASM 1.5.5-rc3. Sample data and guide examples are separate from the original catalog.

```sql
SELECT decode('\xC3\xBC'::BLOB);
```

```sql
SELECT decode('\xA0'::BLOB, 'replace');
```

```sql
SELECT decode('\xA0'::BLOB, 'ignore');
```

## Additional DuckDB documentation

- [Blob Functions](https://duckdb.org/docs/current/sql/functions/blob#decodeblob-on_error)

## In other engines

### Apache Spark: decode()



Apache Spark:

```sql
DECODE(x, 'utf-8')
```

Haybarn / DuckDB:

```sql
DECODE(x)
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_duckdb.py#L2308).

### Presto: from_utf8()



Presto:

```sql
FROM_UTF8(x)
```

Haybarn / DuckDB:

```sql
DECODE(x)
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_duckdb.py#L2308).

### Snowflake: base64_decode_string()



Snowflake:

```sql
SELECT BASE64_DECODE_STRING('U25vd2ZsYWtl')
```

Haybarn / DuckDB:

```sql
SELECT DECODE(FROM_BASE64('U25vd2ZsYWtl'))
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_snowflake.py#L3145).

## Observed availability

| Snapshot | Observed | Overloads | JSON |
| --- | --- | --- | --- |
| haybarn-1.5.5-rc3 | present | 2 | [reference](/products/haybarn/functions/api/v1/haybarn-1.5.5-rc3/functions/decode.json) |
| duckdb-1.5.5 | present | 2 | [reference](/products/haybarn/functions/api/v1/duckdb-1.5.5/functions/decode.json) |
| duckdb-1.4.4 | present | 1 | [reference](/products/haybarn/functions/api/v1/duckdb-1.4.4/functions/decode.json) |
| duckdb-1.3.2 | present | 1 | [reference](/products/haybarn/functions/api/v1/duckdb-1.3.2/functions/decode.json) |

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