MaxGekk commented on issue #25998: [SPARK-29328][SQL] Fix calculation of mean seconds per month URL: https://github.com/apache/spark/pull/25998#issuecomment-537977342 > If that's also what other mainstream databases do. PostgreSQL has global constant: https://github.com/postgres/postgres/blob/97c39498e5ca9208d3de5a443a2282923619bf91/src/include/datatype/timestamp.h#L68 . I don't think they have this so much brave assumption about 12 * 31 = 372 days per year in other places.
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