| From: | Juan Pablo Espino <jp(dot)espino(at)gmail(dot)com> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Understanding Rule System |
| Date: | 2005-05-11 21:10:00 |
| Message-ID: | 3e7daec10505111410123df1d7@mail.gmail.com |
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| Lists: | pgsql-hackers |
Hello all
I have been studying the rule system in Postgres. I understand that
the original query tree is the input at the rewrite, and then this
query tree is modified by the rewrite in case that there is a rule.
SQL query ----> Parser ----> Rewrite ----> Planner ----> Executor
^^^^ ^^^^
Query New Query
tree tree
I would like to know how the rewrite detects that a rule in a table
exists, and if it possible you indicate me where in the source code
it's implemented. Any comments are welcome, thanks in advance.
Juan P. Espino
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