SQL window functions provide extremely powerful and useful features that let you work with observations more easily. Different types explained here.

Extra Window Functions for PostgreSQL compatible 9.6–15 This extension provides additional window functions to PostgreSQL. Some of them provide SQL Standard functionality but without the SQL Standard ...

I'm using sparklyr on Databricks (though the issue is not databricks specific) and I see an issue in the SQL translation for aggregation functions. When using a simple aggregation function in a mutate ...