ducklake-java

A java implementation of ducklake. This project is still under development.

Java version

Java 17 or above is required.

examples

Snapshot

publicstaticvoidmain(String[] args) {
// You can use the following command to start a postgres instance for testing.// `docker run -d \// -e POSTGRES_USER=test \// -e POSTGRES_PASSWORD=test \// -e POSTGRES_DB=ducklake_catalog \// -p 5432:5432 \// --name postgres \// postgres:16-alpine`// You can also use other metadata catalogs, such as MySQLMetadataCatalogImpl, DuckDBMetadataCatalogImpl, etc.BaseMetadataCatalogcatalog = newPostgresMetadataCatalogImpl("ducklake_catalog",
"localhost",
5432,
"test",
"test",
".tmp/data_files/");
// After initializing, the catalog will be ready to use. You can query the metadata tables from the postgres instance.catalog.initialize();
Snapshotsnapshot = catalog.getSnapshot(null);
System.out.println("--------------------------------");
System.out.println("snapshot:\n" + snapshot);
System.out.println("--------------------------------");
System.out.println("table:\n" + catalog.getTable(snapshot.id(), newTableIdentifier("a")));
System.out.println("--------------------------------");
catalog.close();
}