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Re: Doubt in parser

From: Michael Glaesemann <grzm(at)myrealbox(dot)com>
To: Dhanaraj <Dhanaraj(dot)M(at)Sun(dot)COM>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Doubt in parser
Date: 2006-03-01 00:23:50
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Lists: pgsql-hackers
On Feb 16, 2006, at 21:37 , Dhanaraj wrote:

> hi
> currently i looking at the postgres src code. I saw the scanner and  
> parser implemetations at two different places (src/backend/parser/   
> and  /src/bakend/bootstrp). Can anybody tell me the purpose of  
> having two phases?? or will this help to parse the queries at  
> different levels?

AFAIK, I don't think the code is exactly the same (though I haven't  
checked). The bootstrap code is used to get the PostgreSQL server  
started: there is a considerable amount of information stored in the  
system catalogs that the server needs to use. The server needs access  
to a scanner/parser to be able to read this information. The  
bootstrap code provides the server with enough knowledge to get  
started. The backend parser and scanner is more feature-filled.

Someone please feel free to step in and correct me if I'm off base :)

Michael Glaesemann
grzm myrealbox com

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