cloud-fan commented on issue #26418: [SPARK-29783][SQL] Support SQL Standard/ISO_8601 output style for interval type URL: https://github.com/apache/spark/pull/26418#issuecomment-552915324 We can't change the behavior of multi-unit syntax as it has been there for a long time, and the pgsql behavior is really confusing. AFAIK the SQL standard only allows one leading `-` in the year-month or day-time interval string, which is difficult for us to follow: how can we represent 1 day - 3 hour?
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