MaxGekk commented on issue #25998: [SPARK-29328][SQL] Fix calculation of mean seconds per month URL: https://github.com/apache/spark/pull/25998#issuecomment-537804330 > Compare with the other DBMS for that queries (especially Hive). I can compare only `months_between` because there are no streaming related functionality in Hive. Hive assumes 31 days per months as well that we can see in its code: https://github.com/apache/hive/blob/287e5d5e4c43beb2bc84a80e342f897494e32c6c/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFMonthsBetween.java#L143-L145
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