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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/05/06 19:15:25 UTC

[GitHub] [arrow-datafusion] Dandandan commented on issue #251: Implement Postgres compatible `now()` function

Dandandan commented on issue #251:
URL: https://github.com/apache/arrow-datafusion/issues/251#issuecomment-833793043


   Just some design input here, IMO it is best to not generate the timestamp at the moment of the first invocation when evaluating the query, but "just" always at the start of the query.
   
   An important optimization is to evaluate / replace the timestamp at planning time as a optimization rule, so it can be used to prune partitions and can be used for predicate pushdown.


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