# array_length — Haybarn WASM 1.5.5-rc3 `array_length` for lists with dimensions other than 1 not implemented - Reference: /products/haybarn/functions/releases/haybarn-1.5.5-rc3/array_length/ - JSON: /products/haybarn/functions/api/v1/haybarn-1.5.5-rc3/functions/array_length.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-7a92881f17904fb9 Kind: scalar. Parameter order: catalog-order. ```text array_length(list: ANY[]) → BIGINT ``` Link: /products/haybarn/functions/releases/haybarn-1.5.5-rc3/array_length/#overload-7a92881f17904fb9 | Argument | Catalog type | Calling mode | | --- | --- | --- | | list | ANY[] | not recorded | Declared return type: BIGINT. Variadic argument type: none declared. Stability: CONSISTENT. Declared side effects: false. Returns the length of the `list`. ### overload-fc1ec7ccff7e14d8 Kind: scalar. Parameter order: catalog-order. ```text array_length(list: ANY[], dimension: BIGINT) → BIGINT ``` Link: /products/haybarn/functions/releases/haybarn-1.5.5-rc3/array_length/#overload-fc1ec7ccff7e14d8 | Argument | Catalog type | Calling mode | | --- | --- | --- | | list | ANY[] | not recorded | | dimension | BIGINT | not recorded | Declared return type: BIGINT. 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-7a92881f17904fb9, overload-fc1ec7ccff7e14d8 ```sql SELECT array_length([1, 2, 3]); ``` ## Runnable examples Executed successfully in Haybarn WASM 1.5.5-rc3. Sample data and guide examples are separate from the original catalog. ```sql SELECT array_length([1, 2, 3]); ``` ## Additional DuckDB documentation - [List Functions](https://duckdb.org/docs/current/sql/functions/list) ## In other engines ### PostgreSQL: array_length() Same function. The SQLGlot example uses the same call in both engines. ```sql ARRAY_LENGTH(arr, 1) ``` Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_postgres.py#L1795). ### Apache Hive: size() Apache Hive: ```sql SIZE(x) ``` Haybarn / DuckDB: ```sql ARRAY_LENGTH(x) ``` Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_hive.py#L684). ### BigQuery: unnest() Uses array_length as part of a larger rewrite. BigQuery: ```sql SELECT * FROM a WHERE b IN UNNEST([1, 2, 3]) ``` Haybarn / DuckDB: ```sql SELECT * FROM a WHERE CASE WHEN [1, 2, 3] IS NULL OR ARRAY_LENGTH([1, 2, 3]) = 0 THEN FALSE WHEN ARRAY_CONTAINS([1, 2, 3], b) THEN TRUE WHEN b IS NULL OR ARRAY_LENGTH([1, 2, 3]) <> LIST_COUNT([1, 2, 3]) THEN NULL ELSE FALSE END ``` Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_bigquery.py#L1656). ### Presto: cardinality() Presto: ```sql CARDINALITY(x) ``` Haybarn / DuckDB: ```sql ARRAY_LENGTH(x) ``` Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_presto.py#L242). ### Snowflake: arrays_overlap() Uses array_length as part of a larger rewrite. Snowflake: ```sql SELECT ARRAYS_OVERLAP(col1, col2) ``` Haybarn / DuckDB: ```sql SELECT (col1 && col2) OR (ARRAY_LENGTH(col1) <> LIST_COUNT(col1) AND ARRAY_LENGTH(col2) <> LIST_COUNT(col2)) ``` Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_snowflake.py#L1277). ## 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/array_length.json) | | duckdb-1.5.5 | present | 2 | [reference](/products/haybarn/functions/api/v1/duckdb-1.5.5/functions/array_length.json) | | duckdb-1.4.4 | present | 2 | [reference](/products/haybarn/functions/api/v1/duckdb-1.4.4/functions/array_length.json) | | duckdb-1.3.2 | present | 2 | [reference](/products/haybarn/functions/api/v1/duckdb-1.3.2/functions/array_length.json) | Engine catalog documentation is derived from MIT-licensed Haybarn and DuckDB. [Notices](/third-party-notices.txt).