returnString commented on issue #251:
URL: 
https://github.com/apache/arrow-datafusion/issues/251#issuecomment-831808148


   One interesting point - calling `now` multiple times in a single query 
should return the same timestamp (the txn start time, as noted in the Postgres 
docs) so I think we'll need some extra per-query state to store that, and then 
have this function grab the time from there.


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