---
warning: DO NOT CHANGE THIS MANUALLY, THIS IS GENERATED BY https://github.com/duckdb/community-extensions repository, check README there
title: qvd_next
excerpt: |
  DuckDB Community Extensions
  Read (streaming) and write Qlik QVD files - next-generation build of qvd on the DuckDB C API v2

extension:
  name: qvd_next
  description: Read (streaming) and write Qlik QVD files - next-generation build of qvd on the DuckDB C API v2
  version: 0.1.0
  language: Rust
  build: cmake          # community label; the actual build goes through the Rust C-API Makefile
  license: Apache-2.0
  # WASM excluded (file-based reading, Read+Seek); mingw/rtools/musl excluded (ABI).
  excluded_platforms: "wasm_mvp;wasm_eh;wasm_threads;windows_amd64_mingw;windows_amd64_rtools;linux_amd64_musl"
  requires_toolchains: "rust;python3"
  maintainers:
    - snouhaud

repo:
  github: snouhaud/DuckDB-QVD-Extension
  ref: 9e371e8cd8c5ec655b6c52a4090e2c273a05218a

docs:
  hello_world: |
    INSTALL qvd_next FROM community;
    LOAD qvd_next;

    -- Read (streaming, bounded memory)
    SELECT * FROM read_qvd('sales.qvd');
    SELECT * FROM read_qvd('data/*.qvd');         -- glob

    -- Write: field names come from the query
    COPY (SELECT * FROM sales) TO 'output.qvd' (FORMAT qvd);

    -- Import: values are cast to the target table's column types
    COPY sales FROM 'output.qvd' (FORMAT qvd);
  extended_description: |
    Next-generation build of the [`qvd`](https://github.com/duckdb/community-extensions/tree/main/extensions/qvd)
    extension, on DuckDB's C API v2 (via the `duckdb-neo` crate). Same SQL surface
    (`read_qvd`, `COPY ... (FORMAT qvd)`), plus:

    - `COPY ... TO` keeps the query's column names (`FIELD_NAMES` becomes an
      optional override);
    - `COPY ... FROM` casts values to the target table's column types;
    - `read_qvd(path)` is documented in `duckdb_functions()`.

    Reading is streaming and projected (bounded memory; only the projected
    columns' symbol tables are read and decoded), with native typing from the
    Qlik tags, projection pushdown and multi-file glob. All I/O goes through
    DuckDB's file system, so `s3://`, `https://`, etc. work once httpfs is
    loaded (remote globs included). QVD headers are validated against the file
    before reading, so corrupt files fail cleanly.

    Trade-off: the C API v2 is not stable yet, so this build targets one exact
    DuckDB version and is experimental. `qvd` (stable C ABI) remains the
    conservative choice. Load only one of `qvd` / `qvd_next` per session: both
    register `read_qvd` and `FORMAT qvd`.

extension_star_count: 2
extension_star_count_pretty: 2
extension_download_count: 576
extension_download_count_pretty: 576
image: '/images/community_extensions/social_preview/preview_community_extension_qvd_next.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                                       |
|---------------|---------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|--------------------------------------------------------------------------------------|
| read_qvd      | table         | Reads a Qlik QVD file (or a glob of files, concatenated by field name) as a table, typing columns from the Qlik tags and decoding only the projected columns. | NULL    | [SELECT * FROM read_qvd('sales.qvd');, SELECT count(*) FROM read_qvd('data/*.qvd');] |

### 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 |