MaxGekk commented on issue #25408: [SPARK-28687][SQL] Support `epoch`, `isoyear`, `milliseconds` and `microseconds` at `extract()` URL: https://github.com/apache/spark/pull/25408#issuecomment-520915502 @dongjoon-hyun It seems there are many synonyms for the same units in PostgreSQL: https://github.com/postgres/postgres/blob/64579be64a3811d08ea7ccf92b1a443d76b96412/src/backend/utils/adt/datetime.c#L171-L234 . Are you sure we must support all of them?
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