# ARRAYAGG

Aggregates values from rows into an array. Supports collecting values of type `INT`, `LONG`, `FLOAT`, `DOUBLE`, `BIG_DECIMAL`, `STRING`, and `BYTES`. Use the optional `DISTINCT` keyword to collect only distinct values.

## Signature

> ARRAYAGG(colName, 'dataType')
>
> ARRAYAGG(colName, 'dataType', 'DISTINCT')

The `dataType` parameter must be one of: `INT`, `LONG`, `FLOAT`, `DOUBLE`, `BIG_DECIMAL`, `STRING`, or `BYTES`.

## Usage Examples

These examples are based on the [Batch Quick Start](/start-here/quick-start.md#batch-processing).

```sql
select ARRAYAGG(yearID, 'INT') AS years
from baseballStats
WHERE playerName = 'Barry Bonds'
```

| years                                                        |
| ------------------------------------------------------------ |
| \[1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, ...] |

```sql
select ARRAYAGG(league, 'STRING', 'DISTINCT') AS leagues
from baseballStats
WHERE playerName = 'Barry Bonds'
```

| leagues   |
| --------- |
| \[NL, AL] |

When the input column is multi-value, Pinot flattens each row's values into the output array before applying the optional distinct step.


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