Function tuterial -  Mapping columns in Query of DI

Hi friends
I searched Internet to find a good tutorial to help me to write functions in DI, but couldn't find any. I need to write rules for mapping columns in Mapping Section of my query object, but honestly as I don't have a sample or tuterial , I've faced by too many errors.
Could anyone introduce me a link to a good manual for writing mapping functions and custom function?
Any help is greatly appreciated.

(Have solved it by looping instead, but it'd be nice if I
could get the more elegant UNION to work.)

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