cubicweb #4282448 Wrong doc for aggregate functions in RQL [open]

The on-line documentation http://docs.cubicweb.org/annexes/rql/language.html#aggregate-functions for CubicWeb 3.19.3 says that the function COMMA_JOIN shpuld be used to aggregate strings. In reality, the function to be used is GROUP_CONCAT.

prioritynormal
typebug
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