Re: Passing more context info to selectivity-estimation code

From: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: Passing more context info to selectivity-estimation code
Date: 2007-05-20 09:26:50
Message-ID: 4650145A.10500@enterprisedb.com
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Tom Lane wrote:
> Comments, better ideas?

How about building a separate Var-node for the variable when it's above
an outer join? That node would point to the original Var, and have an
additional modifier which indicates the percentage of injected nulls.

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com

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