You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@calcite.apache.org by "Julian Feinauer (Jira)" <ji...@apache.org> on 2019/09/14 06:32:00 UTC
[jira] [Created] (CALCITE-3345) Implement time_bucket function
Julian Feinauer created CALCITE-3345:
----------------------------------------
Summary: Implement time_bucket function
Key: CALCITE-3345
URL: https://issues.apache.org/jira/browse/CALCITE-3345
Project: Calcite
Issue Type: New Feature
Reporter: Julian Feinauer
See here for information on the `time_bucket` function: https://docs.timescale.com/latest/api#time_bucket
This is a more powerful version of the standard PostgreSQL date_trunc function. It allows for arbitrary time intervals instead of the second, minute, hour, etc. provided by date_trunc. The return value is the bucket's start time.
This would especially help with time averaging but keeps everything SQL compliant. E.g. queries like
Example query from (https://www.timescale.com/):
{code:sql}
SELECT time_bucket('10 seconds', time) AS ten_second,
machine_id, avg(temperature) AS "avgT",
min(temperature) AS "minT", max(temperature) AS "maxT",
last(temperature, time) AS "lastT"
FROM measurements
WHERE machine_id = 'C931baF7'
AND time > now() - interval '150s'
GROUP BY ten_second
ORDER BY ten_second DESC;
{code}
--
This message was sent by Atlassian Jira
(v8.3.2#803003)