# map — Haybarn WASM 1.5.5-rc3

Creates a map from a set of keys and values

- Reference: /products/haybarn/functions/releases/haybarn-1.5.5-rc3/map/
- JSON: /products/haybarn/functions/api/v1/haybarn-1.5.5-rc3/functions/map.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-cd418dc0fdd39592

Kind: scalar. Parameter order: catalog-order.

```text
map() → MAP("NULL", "NULL")
```

Link: /products/haybarn/functions/releases/haybarn-1.5.5-rc3/map/#overload-cd418dc0fdd39592

| Argument | Catalog type | Calling mode |
| --- | --- | --- |

Declared return type: MAP("NULL", "NULL"). Variadic argument type: none declared.
Stability: CONSISTENT. Declared side effects: false.

### overload-a9705c0169d92bba

Kind: scalar. Parameter order: catalog-order.

```text
map(keys: K[], values: V[]) → MAP(K, V)
```

Link: /products/haybarn/functions/releases/haybarn-1.5.5-rc3/map/#overload-a9705c0169d92bba

| Argument | Catalog type | Calling mode |
| --- | --- | --- |
| keys | K[] | not recorded |
| values | V[] | not recorded |

Declared return type: MAP(K, V). 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-cd418dc0fdd39592, overload-a9705c0169d92bba

```sql
SELECT map(['key1', 'key2'], ['val1', 'val2']);
```

## Runnable examples

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

```sql
SELECT map(['key1', 'key2'], ['val1', 'val2']);
```

## Additional DuckDB documentation

- [Creating JSON](https://duckdb.org/docs/current/data/json/creating_json#json-creation-functions)
- [Map Type](https://duckdb.org/docs/current/sql/data_types/map#creating-maps)
- [Data Types](https://duckdb.org/docs/current/sql/data_types/overview#nested--composite-types)

## In other engines

### Apache Hive: map()



Apache Hive:

```sql
MAP(a, b)
```

Haybarn / DuckDB:

```sql
MAP([a], [b])
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_hive.py#L773).

### Apache Spark



Apache Spark:

```sql
MAP_FROM_ARRAYS(ARRAY(1), c)
```

Haybarn / DuckDB:

```sql
MAP([1], c)
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_spark.py#L1015).

### Presto



Presto:

```sql
CAST(MAP(ARRAY['key'], ARRAY[1]) AS MAP(VARCHAR, INT))
```

Haybarn / DuckDB:

```sql
CAST(MAP(['key'], [1]) AS MAP(TEXT, INT))
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_presto.py#L135).

### Snowflake

Uses map as part of a larger rewrite.

Snowflake:

```sql
SELECT GET(col::MAP(INTEGER, VARCHAR), 1)
```

Haybarn / DuckDB:

```sql
SELECT CAST(col AS MAP(INT, TEXT))[1]
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_snowflake.py#L6176).

### StarRocks: map()



StarRocks:

```sql
SELECT MAP('a', 1, 'b', 2)
```

Haybarn / DuckDB:

```sql
SELECT MAP(['a', 'b'], [1, 2])
```

Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_starrocks.py#L56).

## 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/map.json) |
| duckdb-1.5.5 | present | 2 | [reference](/products/haybarn/functions/api/v1/duckdb-1.5.5/functions/map.json) |
| duckdb-1.4.4 | present | 2 | [reference](/products/haybarn/functions/api/v1/duckdb-1.4.4/functions/map.json) |
| duckdb-1.3.2 | present | 1 | [reference](/products/haybarn/functions/api/v1/duckdb-1.3.2/functions/map.json) |

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