How does pg implement the visiblity of one tuple for specified transaction?

From: "jacktby(at)gmail(dot)com" <jacktby(at)gmail(dot)com>
To: pgsql-hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: How does pg implement the visiblity of one tuple for specified transaction?
Date: 2023-03-05 13:19:02
Message-ID: 202303052105574472012@gmail.com
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Suppose there is a transaction running, how it knows the tuples that are
visible for it?

jacktby(at)gmail(dot)com

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