[DOCS] Creating variable argument user defined functions in C - Mailing list pgsql-docs

Hi, 

For my project, I need to create a variable argument function which accepts
multiple strings & returns some transformed string. I've gone through the
https://www.postgresql.org/docs/9.6/static/xfunc-c.html doc..But there's no
clear documentation for variable args. 

I'able to understand we can have ArrayType as data type for same. But how to
iterate & process it??? Kindly help. 





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