Hoo, I'm surprised no one noticed this during 7.4 development/testing. The problem applies for any datatype that requires double alignment, which includes int8, float8, and timestamp as well as most of the geometric types. pg_statistic is declared as using type "anyarray", and this type really needs to be marked as requiring double alignment so that arrays of double-aligned datatypes will come out correctly.
anyarray has been defined this way since 7.3 -- any concerns there? I see that back then pg_statistic used text[] instead of anyarray, so perhaps not.
Joe
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