Road map to study about fetching a set of tuples - novice!

From: Soroosh Sardari <soroosh(dot)sardari(at)gmail(dot)com>
To: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Road map to study about fetching a set of tuples - novice!
Date: 2013-05-18 14:31:42
Message-ID: CAFUsPDY3+As3=dnfsqN3prZG5Ju6U+0snBs-ZY44rOJ=iewSyw@mail.gmail.com
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Hi

I was tracing a simple SELECT query to find how pg works for fetching
tuples.
but I'm totally lost in the code.
Could you help me to understand under the hood?
I know about parsing and planning parts, my actual problem is executer.
If you show me a road map to study, I would appreciate it.

Regards
Soroosh

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