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

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.

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