Add more examples for the playground.
We added some initialization data for the playground.
I add an Apache Hive catalog to store sales department data.
I add a PostgreSQL catalog to store hr department data.
Add some examples about cross-catalog queries.
Add more examples for the playground. We added some initialization data for the playground. I add an Apache Hive catalog to store sales department data. I add a PostgreSQL catalog to store hr department data. Add some examples about
cross-catalog
queries.