Custom Function in FastExport?

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Custom Function in FastExport?

Are we able to write custom functions in fastexport? a function which is then used in a select statement.

I have seen a sample written in our design documents but am unable to see a reference material on custom functions inside fexp.

If anyone can enlighten me on this (liek provide sample scripts) or point me to a reference material for it, I would appreciate it.

Thanks!