DuckDB

Below is an example of using DuckDB ↗ to connect to R2 Data Catalog. For more information on connecting to R2 Data Catalog with DuckDB, refer to DuckDB documentation ↗.

Prerequisites

• Sign up for a Cloudflare account ↗.
• Create an R2 bucket and enable the data catalog.
• Create an R2 API token with both R2 and data catalog permissions.
• Install DuckDB ↗.
  • Note: DuckDB 1.4.0 ↗ or greater is required to attach and write to Iceberg REST Catalogs ↗.
• Note: DuckDB does not currently support ↗ DELETE on partitioned tables.

Example usage

In the DuckDB CLI ↗ (Command Line Interface), run the following commands:

-- Install the iceberg DuckDB extension (if you haven't already) and load the extension.
INSTALL iceberg;
LOAD iceberg;

-- Install and load httpfs extension for reading/writing files over HTTP(S).
INSTALL httpfs;
LOAD httpfs;

-- Create a DuckDB secret to store R2 Data Catalog credentials.
CREATE SECRET r2_secret (
    TYPE ICEBERG,
    TOKEN '<token>'
);

-- Attach R2 Data Catalog with the following ATTACH statement.
ATTACH '<warehouse_name>' AS my_r2_catalog (
    TYPE ICEBERG,
    ENDPOINT '<catalog_uri>'
);

-- Create the default schema in the catalog and set it as the active schema.
CREATE SCHEMA my_r2_catalog.default;
USE my_r2_catalog.default;

-- Create and populate a sample Iceberg table with data.
CREATE TABLE my_iceberg_table AS SELECT a FROM range(4) t(a);

-- Show all available tables.
SHOW ALL TABLES;

-- Query the Iceberg table you just created.
SELECT * FROM my_r2_catalog.default.my_iceberg_table;

Explain Code