viewzoo

This Trino connector stores virtual views, which allow improvising, extending, and re-platforming data sources while seamlessly preserving compatability with all applications. Virtual views are particularly useful for prototyping and updating existing applications to use Apache Iceberg. This is a lightweight connector and does not require configuring a metastore or object storage.

This connector was originally published for my presentation on virtual view hierarchies at Trino Summit 2024, and is being maintained as a small way to give back to the Trino community.

Dependencies

• Java 23
• Trino 470

Configuring Local Environment

1. Install Trino
download and expand tarball to local directory
export TRINO_HOME=$HOME/...

2. Create $TRINO_HOME/etc/catalog/viewzoo.properties:
connector.name=viewzoo
viewzoo.dir=/tmp/viewzoo

3. Build the connector and redeploy
mvn clean package && rm -rf $TRINO_HOME/plugin/viewzoo /tmp/viewzoo && cp -r ./target/viewzoo-470 $TRINO_HOME/plugin/viewzoo && mkdir -p /tmp/viewzoo

4. Start Trino
cd $TRINO_HOME
bash bin/launcher run

Defining and Using Views

Create a view with a static result set:

create or replace view viewzoo.example.hello as select * from (values (1, 'a'), (2, 'b'), (3, 'c')) as t (key, value)

Select rows from the view:

select * from viewzoo.example.hello

Delete the view:

drop view viewzoo.example.hello

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© 2024-2025 Rob Dickinson (robfromboulder)