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Asked: 2026-06-13T07:51:22+00:00

I’m using hsql and another 3rd party library. To solve a certain problem I

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I’m using hsql and another 3rd party library. To solve a certain problem I need to write my custom aggregate function. This page showed me how to do that: http://hsqldb.org/doc/2.0/guide/sqlroutines-chapt.html#src_jrt_routines

However, the other 3rd party tool restricts me to use only a predefined subset of aggregate functions. Is there any way to add an overloaded version e.g. to sum which takes a predefined type and then invokes my custom logic? I’m thinking of something very similar to the method overloading of java. Unfortunately create aggregate function custom_sum(...)... works, but create aggregate function sum(...)... doesn’t.

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1 Answer

  1. Editorial Team

    User functions cannot override built-in functions.

    You can of course disable the SUM() function by modifying the HSQLDB sources.

    What is the actual problem which forces you to provide your own version of SUM()?

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