---
warning: DO NOT CHANGE THIS MANUALLY, THIS IS GENERATED BY https://github.com/duckdb/community-extensions repository, check README there
title: holtfs
excerpt: |
  DuckDB Community Extensions
  Holt-backed metadata indexes for fast DuckDB file discovery

extension:
  name: holtfs
  description: Holt-backed metadata indexes for fast DuckDB file discovery
  version: 0.1.0
  language: C++
  build: cmake
  license: MIT
  excluded_platforms: "windows_amd64;windows_amd64_mingw;windows_arm64;wasm_mvp;wasm_eh;wasm_threads;linux_amd64_musl"
  requires_toolchains: rust
  maintainers:
    - feichai0017

repo:
  github: feichai0017/duckdb-holtfs
  ref: 60871b07cb98b515f75c0aaf4efcab72510a4406

docs:
  hello_world: |
    -- Build a persistent Holt metadata index for a local lakehouse path.
    SELECT *
    FROM holtfs_index('/data/lake/table',
                      mode := 'persistent',
                      index_path := '/var/cache/duckdb/table.holt');

    -- Reuse the index for repeated file discovery and partition listing.
    SELECT entry_type, path, version
    FROM holt_files('/var/cache/duckdb/table.holt',
                    mode := 'persistent',
                    prefix := '/data/lake/table/date=2026-05-22/',
                    delimiter := '/');

  extended_description: |
    HoltFS exposes Holt-backed file metadata indexes inside DuckDB.
    It is intended for repeated file-discovery and partition-planning
    workloads where walking a local filesystem or object-store namespace
    is more expensive than querying a cached metadata index.

    The preview release includes persistent and in-memory indexes,
    keys-only namespace scans, delimiter-style listing, manifest freshness
    checks, known-prefix refresh, and exact validation against local file
    size and modification time.

    For usage and benchmark notes, see the
    [duckdb-holtfs documentation](https://github.com/feichai0017/duckdb-holtfs).

extension_star_count: 2
extension_star_count_pretty: 2
extension_download_count: 8183
extension_download_count_pretty: 8.2k
image: '/images/community_extensions/social_preview/preview_community_extension_holtfs.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 |
|-----------------|---------------|-------------|---------|----------|
| holt_files      | table         | NULL        | NULL    |          |
| holtfs_index    | table         | NULL        | NULL    |          |
| holtfs_refresh  | table         | NULL        | NULL    |          |
| holtfs_status   | table         | NULL        | NULL    |          |
| holtfs_validate | table         | NULL        | NULL    |          |
| holtfs_version  | 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>

This extension does not add any settings.