Thank you for the reply!
Indeed I found a connector on Simba but it seems it is not open-source. On Databricks I found this old article but there is no download link for any connector Application Spotlight: Qlik | Databricks
I am not sure if they have the connector or it is in progress. Anyways, they propose Shark in that article but it is no longer used. I wonder if they have a connector for Spark SQL. Do you have more information about the Databricks connector for Spark SQL? Many thanks!