Hi, When analyzing time-series data, it's useful to be able to bin timestamps into equally spaced ranges. date_trunc() is only able to bin on a specified whole unit. In the attached patch for the March commitfest, I propose a new function date_trunc_interval(), which can truncate to arbitrary intervals, e.g.:
select date_trunc_interval('15 minutes', timestamp '2020-02-16
20:48:40'); date_trunc_interval
---------------------
2020-02-16 20:45:00
(1 row)
With this addition, it might be possible to turn the existing
date_trunc() functions into wrappers. I haven't done that here because
it didn't seem practical at this point. For one, the existing
functions have special treatment for weeks, centuries, and millennia.
Note: I've only written the implementation for the type timestamp
without timezone. Adding timezone support would be pretty simple, but
I wanted to get feedback on the basic idea first before making it
complete. I've also written tests and very basic documentation.
--
John Naylor https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
v1-datetrunc_interval.patch
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