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Re: What do these terms mean in the SOURCE CODE?

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Vaibhav Kaushal <vaibhavkaushal123(at)gmail(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: What do these terms mean in the SOURCE CODE?
Date: 2010-11-27 22:30:11
Message-ID: 201011272230.oARMUBe07508@momjian.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Vaibhav Kaushal wrote:
> I am going through the Executor code and come across the following terms
> quite often. Can someone tell me what do they mean (in a few (may be a
> couple of) sentences)?
> 
> 1. Scan State
> 2. Plan State
> 3. Tuple Projection
> 4. EState
> 5. Qual
> 6. Expression
> 
> They sound quite ambiguous in the source code, specially when some of them
> already have terms which have multiple meanings.

Have you read src/backend/executor/README?  It is hard to explain what
these mean without understanding the executor.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

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