Example for intersection operator is wrong

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From: etulsky(at)gmail(dot)com
To: pgsql-docs(at)postgresql(dot)org
Subject: Example for intersection operator is wrong
Date: 2016-07-14 16:28:12
Message-ID: 20160714162812.1425.65054@wrigleys.postgresql.org
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The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.2/static/functions-range.html
Description:

On the page https://www.postgresql.org/docs/9.2/static/functions-range.html
it gives an example for the intersection of range (5,15) and range (10,20)
as [10,15). But 10 isn't included in the second range; the actual output of
this operator is [11,15).


From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: etulsky(at)gmail(dot)com
Cc: pgsql-docs(at)postgresql(dot)org
Subject: Re: Example for intersection operator is wrong
Date: 2016-07-14 17:36:54
Message-ID: 8266.1468517814@sss.pgh.pa.us
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etulsky(at)gmail(dot)com writes:
> The following documentation comment has been logged on the website:
> Page: https://www.postgresql.org/docs/9.2/static/functions-range.html
> Description:

> On the page https://www.postgresql.org/docs/9.2/static/functions-range.html
> it gives an example for the intersection of range (5,15) and range (10,20)
> as [10,15). But 10 isn&#39;t included in the second range; the actual output of
> this operator is [11,15).

Uh, no, it isn't:

regression=# select int8range(5,15) * int8range(10,20);
?column?
----------
[10,15)
(1 row)

You'd be correct if int8range(10,20) produced '(10,20)', but it produces
'[10,20)'.

regards, tom lane