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 |
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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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