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Hive User-Defined Functions (UDFs) are custom functions developed in Java and seamlessly integrated with Apache Hive. UDFs are routines designed to accept parameters, execute a specific action, and return the resulting value. The return value can either be a single scalar row or a complete result set, depending on the UDF's code and the implemented interface.
UDFs represent a powerful capability that enhances classical SQL functionality by allowing the integration of custom code, providing Hive users with a versatile toolset. Apache Hive comes equipped with a variety of built-in UDFs that users can leverage. Similar to other SQL-based solutions, Hive also offers functionality to expand its already rich set of UDFs by incorporating custom ones as needed.

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