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From: Josh Berkus <josh@agliodbs.com>
To: pgsql-performance@postgresql.org
Subject: Re: Why is n_distinct always -1 for range types?
Date: Wed, 25 Sep 2013 10:29:15 -0700
Message-ID: <52431D6B.30302@agliodbs.com> (raw)
In-Reply-To: <WM!47d052793dc0d37aa6bc59183c0d3aca127c0fd4ee7453df3d18aba1fd542a8fb42bb621eb12c8a54c1a218359715a90!@asav-1.01.com>
References: <523B62CF.5080502@agliodbs.com>
	<WM!47d052793dc0d37aa6bc59183c0d3aca127c0fd4ee7453df3d18aba1fd542a8fb42bb621eb12c8a54c1a218359715a90!@asav-1.01.com>
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On 09/19/2013 01:47 PM, Josh Berkus wrote:
> Test:
> 
> 1. create a table with a range type column.
> 2. insert 1000 identical values into that column.
> 3. analyze
> 4. n-distinct will still be listed as -1 (unique) for the column.
> 
> Why?
> 

Anyone?

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com


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