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efficient trigger function selection?

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Suppose I have an RDF-style table (with columns for subject, predicate, various object types, and graph) and want to have dozens or even hundreds of trigger functions defined conditionally on the predicate, ie "when predicate = '<your predicate here>'".

My guess is Postgres is quite efficient at determining which if any trigger functions to call, but I thought I'd ask.

Thx, ken

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