---
warning: DO NOT CHANGE THIS MANUALLY, THIS IS GENERATED BY https://github.com/duckdb/community-extensions repository, check README there
title: delta_classic
excerpt: |
  DuckDB Community Extensions
  Attach a directory of Delta tables as a single DuckDB database with automatic schema discovery

extension:
  name: delta_classic
  description: Attach a directory of Delta tables as a single DuckDB database with automatic schema discovery
  version: 0.2.0
  language: C++
  build: cmake
  license: MIT
  excluded_platforms: "wasm_mvp;wasm_eh;wasm_threads"
  maintainers:
    - djouallah

repo:
  github: djouallah/delta_classic
  andium: 27b979b1f1c161c767f3bb24d9ee67fe28a2f16c
  ref: 3b930e3dd1aded4738c65410bf5026693e862e56

docs:
  hello_world: |
    -- Load required extensions
    LOAD delta;
    LOAD delta_classic;

    -- Attach a directory of Delta tables as a single database
    ATTACH 's3://bucket/lake' AS mydb (TYPE delta_classic, PIN_SNAPSHOT);

    -- Query tables directly
    SELECT * FROM mydb.main.orders LIMIT 10;

    -- Time travel on one table
    SELECT count(*) FROM mydb.main.orders AT (VERSION => 3);

    -- Read every table as of a point in time
    ATTACH 's3://bucket/lake' AS asof (TYPE delta_classic, TIMESTAMP '2026-10-01 00:00:00+00');
  extended_description: |
    Delta Classic lets you attach a directory of Delta Lake tables as a single
    DuckDB database, instead of attaching each table individually. It discovers
    tables by scanning for subdirectories containing a _delta_log folder.

    The extension supports three layouts:
    - Single table: the attached path is itself a Delta table
    - Single-schema: the attached path directly contains Delta tables
    - Multi-schema: the attached path contains subdirectories, each treated as
      a schema, with Delta tables inside them

    All Delta reading is delegated to the Delta extension via internal
    ATTACH ... (TYPE DELTA). The ATTACH options PIN_SNAPSHOT, TIMESTAMP,
    PUSHDOWN_FILTERS and PUSHDOWN_PARTITION_INFO are passed to every table, and
    AT (VERSION => ...) / AT (TIMESTAMP => ...) work per query. Works with all
    storage backends (local filesystem, S3 and S3-compatible stores, ABFSS, GCS).
    Read-only. Not available in DuckDB-WASM, because the Delta extension has no
    WASM build.

extension_star_count: 6
extension_star_count_pretty: 6
extension_download_count: 887
extension_download_count_pretty: 887
image: '/images/community_extensions/social_preview/preview_community_extension_delta_classic.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>

This extension does not add any functions.

### 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 |