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With 9.1's use of Params to pass down values from NestLoop join nodes to their inner plans, it is possible for a Param to have type RECORD, in which case the set of fields comprising the value isn't determinable by inspection of the Param alone. However, just as with a Var of type RECORD, we can find out what we need to know if we can locate the expression that the Param represents. We already knew how to do this in get_parameter(), but I'd overlooked the need to be able to cope in get_name_for_var_field(), which led to EXPLAIN failing with "record type has not been registered". To fix, refactor the search code in get_parameter() so it can be used by both functions. Per report from Marti Raudsepp. |
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