# Filter

> Supported in: Batch, Faster, Streaming

Filters the input dataset based on the specified filter condition.

**Transform categories**: Data preparation, Popular

## Declared arguments

* **Dataset:** Dataset to filter.<br>*Table*
* **Filter condition:** Condition to filter on. Values that return true are kept, others are removed.<br>*Expression\<Boolean>*

## Examples

### Example 1: Base case

**Argument values:**

* **Dataset:** ri.foundry.main.dataset.a
* **Filter condition:** `recently_serviced`

**Input:**

| recently\_serviced | tail\_number |
| ----- | ----- |
| true | KK-150 |
| false | XB-120 |
| true | MT-190 |

**Output:**

| recently\_serviced | tail\_number |
| ----- | ----- |
| true | KK-150 |
| true | MT-190 |

***

### Example 2: Base case

**Description:** Nulls are treated as false

**Argument values:**

* **Dataset:** ri.foundry.main.dataset.a
* **Filter condition:** `recently_serviced`

**Input:**

| recently\_serviced | tail\_number |
| ----- | ----- |
| *null* | KK-150 |
| true | XB-120 |

**Output:**

| recently\_serviced | tail\_number |
| ----- | ----- |
| true | XB-120 |

***