yaooqinn 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-552885115 > -2 day 23 hour ```sql postgres=# select interval '-2 -23:00:00'; interval ------------- -2 23:00:00 (1 row) postgres=# select interval '-2 23:00:00'; interval ------------- -2 23:00:00 (1 row) postgres=# select interval '-2 +23:00:00'; interval ------------------- +0-0 -2 +23:00:00 (1 row) postgres=# select interval '-2 days 23 hours' ; interval ------------- -2 23:00:00 (1 row) postgres=# select interval '-2 days -23 hours' ; interval ------------- -2 23:00:00 (1 row) ``` totally confused with Postgres‘s output, the proper way I guess we need a explictly '+' from time part @cloud-fan
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