Functions Creating Javascript User-defined FunctionsWith SQL Stream Builder, you can create user functions to write powerful functions in JavaScript that you can use to enhance the functionality of SQL.Creating Java User-defined functionsYou can create User Defined Functions (UDF) using Java after manually adding the UDF function JAR file that contains the UDF class to the Flink connectors. After uploading the JAR file on the Streaming SQL Console, you can use the Java UDFs for your SQL jobs.Using System FunctionsThe same set of system functions can be used for SQL Stream Builder as for Apache Flink.