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UDFs are powerful capability that extends the classical SQL functionality with custom code, that the Hive user can utilize. Hive has a bunch of built-in UDFs that you can utilize. Like other SQL-based solutions, Apache Hive also provides functionality to extend the current - rich- UDF set with custom if needed.
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Important to mention. Every UDF's evaluate method one row at a time! Which means if your UDF's has complex code, it could introduce performance issue in execution time. |