Can I create a Delta Lake table on Databricks and query it with open-source Spark?
Yes, in order to do this, you would install Open Source Spark and Delta Lake, both are open source. Delta Engine, which is only available on Databricks, will make delta faster than open source, with full support. Read this blog for more information.
https://databricks.com/blog/2019/10/03/simple-reliable-upserts-and-deletes-on-delta-lake-tables-usin...