Delta Lake Explorer

Delta Lake Explorer is a Streamlit application that allows users to explore Delta Lake tables on Azure Data Lake Storage using DuckDB. The application provides a code editor for writing SQL queries, a sidebar for configuring settings, and a result viewer for displaying query results.

Screenshots

Features

• Code Editor: Write and execute SQL queries.
• Query Parsing: Automatically parse and transform queries to use delta_scan.
• Query Timing: Display the time taken to execute queries.

Installation

1. Clone the repository:

git clone https://github.com/mrjsj/delta-lake-explorer.git
cd delta-lake-explorer

2. Create a virtual environment:

python -m venv .venv
source .venv/bin/activate # On Windows, use .venv\Scripts\activate

3. Install the required packages:

pip install -r requirements.txt

Configuration

1. Rename the .streamlit/secrets-template.toml to .streamlit/secrets.toml:

2. Fill in the following values in .streamlit/secrets.toml:

   • STORAGE_ACCOUNT_NAME: The name of your Azure storage account.
   • DELTA_LAKE_ROOT_PATH: The root path up until the delta lake catalog. This includes the container name and the path to the delta lake catalog. E.g., if the full delta table path is abfss://container/path/to/catalog/layer/table, then the root path is container/path/to. If the delta lake catalog is at the root of the storage account, then the root path is an empty string.

3. Choose a way to authenticate to Azure. You can use a service principal, or a Azure CLI login. In either case, make sure you have at least Storage Blob Data Reader role assigned to your service principal or your personal user on the storage account.

   • If you choose a service principal, fill in the following values in .streamlit/secrets.toml:
     • AZURE_TENANT_ID: The tenant ID of your Azure AD.
     • AZURE_CLIENT_ID: The client ID of your service principal.
     • AZURE_CLIENT_SECRET: The client secret of your service principal.
   • If you choose Azure CLI login, run az login before running the application.

Usage

Run the Streamlit application:

streamlit run main.py

Query using DuckDB syntax. Tables must be refences by catalog.schema.table, e.g.:

SELECT * FROM catalog.schema.table;

For more information on DuckDB syntax, see the DuckDB documentation.

License

This project is licensed under the MIT License. See the LICENSE file for details.