Cardinality estimation for group by

From: Chenxi Li <spiritlcx(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Cardinality estimation for group by
Date: 2016-10-04 12:05:06
Message-ID: CAJQBB7Khy6N70phZXSqGNXOyuiSeukwM4hc0PBXD5bsmU0=pzw@mail.gmail.com
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Friends,

How is cardinality estimation for "group by" is done and where is the code
doing that?

Best Regards,
Chenxi Li

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