[rql2sql] added test that shows crash during sql generation Original query in cubicweb-drh: Any A,E,CV,group_concat(TN) GROUPBY A,E,CV WHERE A is Application, A for_person P, P has_studied_in E?, T? tags A, T name TN, A curriculum CV? Corresponding bug in tracker: #628798

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^doc/book/en/apidoc$