a898b409f6
interval_mul() attempts to prevent its calculations from producing silly results, but it forgot that zero times infinity yields NaN in IEEE arithmetic. Hence, a case like '1 second'::interval * 'infinity'::float8 produced a NaN for the months product, which didn't trigger the range check, resulting in bogus and possibly platform-dependent output. This isn't terribly obvious to the naked eye because if you try that exact case, you get "interval out of range" which is what you expect --- but if you look closer, the error is coming from interval_out not interval_mul. interval_mul has allowed a bogus value into the system. Fix by adding isnan tests. Noted while testing Vitaly Burovoy's fix for infinity input to to_timestamp(). Given the lack of field complaints, I doubt this is worth a back-patch.
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