From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Wen Yi <chuxuec(at)outlook(dot)com> |
Cc: | PostgreSQL General <pgsql-general(at)lists(dot)postgresql(dot)org> |
Subject: | Re: What type of Compiler to SQL? Memory-Image (Load-and-Go) Format? |
Date: | 2023-05-05 01:16:20 |
Message-ID: | ZFRY5JungV6HM0aW@momjian.us |
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Lists: | pgsql-general |
On Fri, May 5, 2023 at 01:00:37AM +0000, Wen Yi wrote:
> Hi team,
> I am a newbie to the postgres.
> When I am studying the compiler,the text book tell me there is there type of
> compiler.
>
> 1. Assembly Language Format
> 2. Relocatable Binary Format
> 3. Memory-Image (Load-and-Go) Format
>
> I check the postgres's sql compiler, and it's achieved by lex & yacc.
> So What type of Compiler to SQL? Is Memory-Image (Load-and-Go) Format ?
Lex and yacc load command-specific structures, or a Query structure for
SELECT, INSERT, UPDATE, DELETE, MERGE.
The Query structure is converted into a Plan which is executed by the
executor. It is not compiled into assembly language. See this:
https://www.postgresql.org/developer/backend/
A
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com
Embrace your flaws. They make you human, rather than perfect,
which you will never be.
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