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Extension descriptor (YAML)

Export DuckLake catalog tables to Delta Lake format

Installing and Loading

INSTALL delta_export FROM community;
LOAD delta_export;

Example

-- Load required extensions
LOAD ducklake;
LOAD delta_export;

-- Attach a DuckLake catalog
ATTACH 'ducklake:metadata.ducklake' AS lake (DATA_PATH '/path/to/data');
USE lake;

-- Create and populate a table
CREATE TABLE orders (id INTEGER, amount DOUBLE);
INSERT INTO orders VALUES (1, 99.99), (2, 149.50);

-- Export all DuckLake tables to Delta Lake format
CALL delta_export();

About delta_export

Delta Export reads DuckLake internal metadata and writes Delta Lake checkpoint files (Parquet, JSON transaction log, and _last_checkpoint) for each table in the catalog.

This enables interoperability between DuckLake-managed data and any system that reads Delta Lake format, such as Apache Spark, Databricks, Microsoft Fabric, and other Delta-compatible engines.

Works with both DuckDB and SQLite-backed DuckLake catalogs, and supports all storage backends including local filesystem and ABFSS.

Added Functions

Overloaded Functions

This extension does not add any function overloads.

Added Types

This extension does not add any types.

Added Settings

This extension does not add any settings.