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help / color / mirror / Atom feedFrom: Tom Lane <tgl@sss.pgh.pa.us>
To: James Cloos <cloos@jhcloos.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: using possibly null timestamptz columns
Date: Thu, 29 Sep 2016 09:15:22 -0400
Message-ID: <5497.1475154922@sss.pgh.pa.us> (raw)
In-Reply-To: <5086.1475154348@sss.pgh.pa.us>
References: <m3a8eqx4rx.fsf@carbon.jhcloos.org>
<5086.1475154348@sss.pgh.pa.us>
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I wrote:
> You could try constructing a GIST or SPGIST index on the ranges
> tstzrange(s, e), where you'd have to do something to convert null
> endpoints to infinities, and then probing with WHERE rangeexpr @> now().
Or actually, it looks like tstzrange() already does the right thing:
regression=# select tstzrange(now(), null);
tstzrange
-----------------------------------
["2016-09-29 09:12:14.79429-04",)
(1 row)
regression=# select tstzrange(null, now());
tstzrange
------------------------------------
(,"2016-09-29 09:12:33.632327-04")
(1 row)
So this just reduces to WHERE tstzrange(s, e) @> now().
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, cloos@jhcloos.com
Subject: Re: using possibly null timestamptz columns
In-Reply-To: <5497.1475154922@sss.pgh.pa.us>
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