How to connect Databricks Spark to ClickHouse

The text discusses how to connect Databricks Spark to ClickHouse, an open-source column-oriented database management system known for its speed and wide range of applications it can be connected to. To do this, the user needs to set up ClickHouse on Double.Cloud, create a new cluster in Databricks' libraries tab, install the maven option with specific coordinates, and then use JDBC to connect Spark to ClickHouse. The text also provides code examples for reading from and writing to ClickHouse tables using DataFrames.