---
warning: DO NOT CHANGE THIS MANUALLY, THIS IS GENERATED BY https://github.com/duckdb/community-extensions repository, check README there
title: apart
excerpt: |
  DuckDB Community Extensions
  Evaluate affine decision trees in SQL

extension:
  name: apart
  description: Evaluate affine decision trees in SQL
  version: 0.3.0
  language: C++
  build: cmake
  license: MIT
  opt_in_platforms: "osx_amd64"
  maintainers:
    - jokasimr

repo:
  github: jokasimr/apart
  ref: 4a70fcba4cee657bcd5217638d62d838d3762748
  variegata: 0b216f8d1604ba731f21b20aad72ab4614370634

docs:
  hello_world: |
    LOAD apart;

    -- Split on x + y = 1, then on x - y = 0.
    SELECT x, y,
           decision_tree(
             {
                 weights: [
                     [1.0, 1.0],
                     [1.0, -1.0],
                     [1.0, -1.0]
                 ],
                 thresholds: [1.0, 0.0, 0.0],
                 children: [[2, 3], [-1, -2], [-4, -3]],
                 values: ['A', 'B', 'C', 'D']
             },
             x, y
           ) AS region
    FROM (VALUES (1, 0), (0, 1), (-1, 0), (0, -1)) AS points(x, y);
  extended_description: |
    `apart` evaluates affine decision trees. Each node compares a weighted sum
    of the inputs with a threshold, and each leaf supplies a result.

    The tree stays constant for the query while the inputs vary by row. Inputs
    can be separate columns or a fixed-size array. Leaf values can use any
    DuckDB type, including lists and structs.

    See the [documentation](https://github.com/jokasimr/apart#readme) and
    [example use cases](https://github.com/jokasimr/apart/tree/main/examples).

extension_star_count: 1
extension_star_count_pretty: 1
extension_download_count: 845
extension_download_count_pretty: 845
image: '/images/community_extensions/social_preview/preview_community_extension_apart.png'
layout: community_extension_doc
---
### Compatibility Matrix

This table covers all DuckDB releases that have not reached [end-of-life](https://duckdb.org/release_calendar), including LTS releases, and shows the 2 most recent patch releases of each. Older patch releases are not listed, but the extension may be available for them as well.

<div class="extension_compatibility_table"></div>

| Platform | 1.4.4 | 1.4.5 | 1.5.5 | 1.5.6 | 2.0.0 |
| :--- | :---: | :---: | :---: | :---: | :---: |
| Linux AMD64 | ❌ | ❌ | ✅ | ✅ | ✅ |
| Linux ARM64 | ❌ | ❌ | ✅ | ✅ | ✅ |
| macOS AMD64 | ❌ | ❌ | ✅ | ✅ | ✅ |
| macOS ARM64 | ❌ | ❌ | ✅ | ✅ | ✅ |
| Windows AMD64 | ❌ | ❌ | ✅ | ✅ | ✅ |
| Windows ARM64 | ❌ | ❌ | ❌ | ❌ | ❌ |
| WebAssembly | ❌ | ❌ | ✅ | ✅ | ✅ |

### Installing and Loading
```sql
INSTALL {{ page.extension.name }} FROM community;
LOAD {{ page.extension.name }};
```

{% if page.docs.hello_world %}
### Example
```sql
{{ page.docs.hello_world }}```
{% endif %}

{% if page.docs.extended_description %}
### About {{ page.extension.name }}
{{ page.docs.extended_description }}
{% endif %}
### Added Functions

<div class="extension_functions_table"></div>

| function_name | function_type | description | comment | examples |
|---------------|---------------|-------------|---------|----------|
| decision_tree | scalar        | NULL        | NULL    |          |
| fixed_depth   | scalar        | NULL        | NULL    |          |

### Overloaded Functions

<div class="extension_functions_table"></div>

This extension does not add any function overloads.

### Added Types

<div class="extension_types_table"></div>

This extension does not add any types.

### Added Settings

<div class="extension_settings_table"></div>

|      name      |                       description                       | input_type | scope  | aliases | typed_value |
|----------------|---------------------------------------------------------|------------|--------|---------|-------------|
| temp_directory | Set the directory to which temporary files are written. | VARCHAR    | GLOBAL | []      | post.db.tmp |