BigQuery User-Defined Functions and Extensibility

This feature thread tracks the evolution of Google BigQuery's capabilities, focusing on enhancing its extensibility and enabling developers to perform more complex data analysis. Early efforts likely focused on the core BigQuery service and its SQL interface. Subsequent developments have introduced User-Defined Functions (UDFs), allowing users to extend BigQuery's SQL with custom logic written in JavaScript and other languages. This enables more sophisticated data transformations, custom aggregations, and integration with external libraries, significantly broadening the scope of data analysis possible within BigQuery.