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There's no good reason why plpgsql's GET DIAGNOSTICS statement can't support an array element as target variable, since the execution code already uses the generic exec_assign_value() function to assign to it. Hence, refactor the grammar to allow that, by making getdiag_target depend on the assign_var production. Ideally we'd also let a cursor_variable expand to an element of a refcursor[] array, but that's substantially harder since those statements also have to handle bound-cursor-variable cases. For now, just make sure the reported error is sensible, ie "cursor variable must be a simple variable" not "variable must be of type cursor or refcursor". The latter was quite confusing from the user's viewpoint, since what he wrote satisfies the claimed restriction. Per bug #14463 from Zhou Digoal. Given the lack of previous complaints, I see no need for a back-patch. Discussion: https://postgr.es/m/20161213152548.14897.81245@wrigleys.postgresql.org |
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