Overview

The Extension framework in database systems is a mechanism that allows dynamically adding new functionality without modifying the core engine code. NeuG also provides an Extension framework that enables external users to flexibly load new features, with the following key advantages:

Core engine remains lean: Provides essential functionality for query parsing, optimization, and execution
New features developed as plugins: Offers rich external extension capabilities, such as external data import, graph algorithm analysis, etc.
Reduced maintenance complexity: Avoids core code bloat, improving readability and stability

Available Extensions

The following extensions are currently supported or planned to be supported in NeuG:

Category	Extension	Description	Since Version
Data Source	JSON	Import & export data from JSON file format	v0.1
Data Source	PARQUET	Import & Export data from PARQUET format files	planned v0.2
VFS	HTTP/HTTPS/S3/OSS	Provide data source based on HTTP/HTTPS/S3/OSS protocol	planned v0.2
Graph Algorithm	K-Core	Find all subgraphs with core number ≥ k. Returns `(node, core_number)`	planned v0.2
Graph Algorithm	PageRank	Calculate node importance scores. Returns `(node, rank)`	planned v0.2
Graph Algorithm	Shortest Path (Dijkstra)	Single-source shortest path algorithm	planned v0.2
Graph Algorithm	Connected Components	Weakly connected components detection	planned v0.2
Graph Algorithm	Leiden	Community detection algorithm for finding communities in networks	planned v0.2
Graph Algorithm	Label Propagation	Community detection algorithm that propagates labels through the network	planned v0.2
Graph Algorithm	Subgraph Matching (Estimator)	Unbiased estimation of subgraph matching	planned v0.2

Using Extensions

The following sections detail how to install and use the extensions listed above.

Install Extension

The INSTALL command downloads official extensions from the NeuG Official Repository to your local machine. NeuG automatically downloads the appropriate platform-specific dynamic library based on your current operating system.

Regarding the local download path, please note the following:

By default, extensions are downloaded to <python_wheel_install_home>/extension/<extension_name>.
You can set the EXTENSION_HOME environment variable to specify a custom download directory. When set, extensions will be downloaded to $EXTENSION_HOME/extension/<extension_name>.

NeuG automatically performs checksum verification on downloaded content to detect issues caused by network interruptions that might make extensions unusable. If the checksum verification fails, the downloaded file will be automatically removed and an error will be returned.


INSTALL <extension_name>;

Example: Download JSON Extension


INSTALL JSON;

Load Extension

The LOAD command loads the dynamic library from $EXTENSION_HOME/extension/<extension_name> (or <python_wheel_install_home>/extension/<extension_name> if EXTENSION_HOME is not set) into the current database for use in subsequent queries.


LOAD <extension_name>;

Example: Load JSON Extension


LOAD JSON;

List Extensions

Use the CALL command to view currently loaded extensions. This command outputs the extension name and description.


CALL SHOW_LOADED_EXTENSIONS() RETURN *;

Example output:

Extension Name	Description
JSON	Provides functions to read and write JSON files.

Uninstall Extensions

The UNINSTALL command removes the downloaded dynamic library from the local installation directory. This permanently deletes the extension files from your system.


UNINSTALL <extension_name>;

Example: Uninstall JSON Extension


UNINSTALL JSON;

Extension Lifecycle

The typical lifecycle of an extension follows these steps:

Install: Download the extension from the official repository to your local system
Load: Load the extension into your current database to make it available for use
Use: Execute queries that utilize the extension’s functionality
Unload: Extensions are automatically unloaded when the database closes
Uninstall: Remove the extension files from your local system when no longer needed