We are currently using Spark as our SQL engine with Thrift Server but are evaluating Databricks Serverless SQL as a potential alternative. We have a few specific questions:

1. Does Databricks Serverless SQL support custom Spark extensions?
2. Can we configure Databricks Serverless SQL to use a custom metastore, especially one that isn’t Hive-compatible?
3. Is it possible to apply custom Spark configurations in Databricks Serverless SQL?

Any insights into these questions would be greatly appreciated!