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When a range type is created, several construction functions are also created, two for the range type and three for the multirange type. These have an internal dependency, so they "belong" to the range type. But there was no way to identify those functions when given a range type. An upcoming patch needs access to the two- or possibly the three-argument range constructor function for a given range type. The only way to do that would be with fragile workarounds like matching names and argument types. The correct way to do that kind of thing is to record to the links in the system catalogs. This is what this patch does, it records the OIDs of these five constructor functions in the pg_range catalog. (Currently, there is no code that makes use of this.) Reviewed-by: Paul A Jungwirth <pj@illuminatedcomputing.com> Reviewed-by: Kirill Reshke <reshkekirill@gmail.com> Discussion: https://www.postgresql.org/message-id/7d63ddfa-c735-4dfe-8c7a-4f1e2a621058%40eisentraut.org |
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