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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/03/14 12:22:10 UTC

[GitHub] [arrow-datafusion] liukun4515 commented on issue #1992: The return type of EXTRACT

liukun4515 commented on issue #1992:
URL: https://github.com/apache/arrow-datafusion/issues/1992#issuecomment-1066722076


   because i hit this document from PG https://www.postgresql.org/docs/14/functions-datetime.html and it points out that
   "The extract function returns values of type `numeric`. The following are valid field names" 
   
   other point from the definition
   ```
   extract ( field from timestamp ) → numeric
   
   Get timestamp subfield; see [Section 9.9.1](https://www.postgresql.org/docs/14/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT)
   
   extract(hour from timestamp '2001-02-16 20:38:40') → 20
   ```


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