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    User-defined functions#

    A user-defined function (UDF) is a custom function authored by a user of Trino in a client application. UDFs are scalar functions that return a single output value, similar to built-in functions.

    More details are available in the following sections:

    • Introduction to UDFs
    • FUNCTION
    • SQL user-defined functions
    • Python user-defined functions
    Previous Window functions
    Next Introduction to UDFs