Re: Why is NULL = unbounded for rangetypes?

<div>På fredag 30. august 2013 kl. 03:23:09, skrev Jeff Davis &lt;<a href="mailto:pgsql(at)j-davis(dot)com" target="_blank">pgsql(at)j-davis(dot)com</a>&gt;:</div>

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<div style="display:inline; font-family: monospace; font-size: 12px;">On Tue, 2013-07-09 at 10:45 +0200, Andreas Joseph Krogh wrote:<br>
&gt; I would expect the queries above to return FALSE and have to use<br>
&gt; INFINITY to have them return TRUE. I don't understand what you mean by<br>
&gt; ranges not allowing either bound to be NULL as it seems to be the case<br>
&gt; (as in &quot;it works&quot;).<br>
<br>
Although passing NULL to the constructor works, it does *not* create a<br>
range where one bound is NULL. It actually creates an unbounded range;<br>
that is, a range where one bound is infinite.<br>
<br>
NULL semantics are far too confusing to be useful with ranges. For<br>
instance, if ranges did support NULLs; the queries you mention would<br>
have to return NULL, not FALSE.</div>
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<div>But I agree that returning NULL would be OK, then it would be easy to catch in queries when starting playing with range-types in queries. Having it implicitly mean infinity comes as a surprise, to me at least.</div>

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<div>But now that I know this it's exactly not a blocker...</div>

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<div class="origo-email-signature">--<br>
Andreas Joseph Krogh &lt;andreak(at)officenet(dot)no&gt;      mob: +47 909 56 963<br>
Senior Software Developer / CTO - OfficeNet AS - http://www.officenet.no<br>
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