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I have a long (and long running, ~30min depending on load) query. It has multiple statements UNION'ed together. Most of the statements are using the GETDATE function[1].

  1. Is the function executed once or multiple times?
  2. If multiple times, would putting it into a WITH statement and then SELECT timestamp FROM <WITH statement> making it getting executed only once?

[1] https://docs.aws.amazon.com/redshift/latest/dg/r_GETDATE.html

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  • The overhead of calling getdate() is so small that you shouldn't worry
    – user1822
    Mar 24, 2020 at 6:11
  • It's not the overhead I am concerned about, but whether I am getting the same timestamp in all subqueries or not. The documentation doesn't say anything about it.
    – kev
    Mar 24, 2020 at 10:29

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