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working on support triggers on columns

From: "Mark Wu" <mark(dot)wu(at)rogers(dot)com>
To: <pgsql-hackers(at)postgresql(dot)org>
Subject: working on support triggers on columns
Date: 2004-07-01 23:38:19
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Lists: pgsql-hackers
I'm currently working on a master student research project "support triggers
on columns" that is supervised by a professor from my university (Ottawa U).
I have contacted Neil Conway whose name is with this item on the TODO list.
It happened that he actually lives very close to me(Queen's U in Kingston).
He has agreed that I work on this.
Please take a look of my design (Some of the ideas are from Neil)

- change gram.y for CREATE TRIGGER to support the optional column list for
this feature,
- change CreateTrigStmt, trigger, trigdesc node to add support for an
optional List of columns; change the various Node  support functions
(equalfuncs.c, copyfuncs.c, etc.)
- change InsertTrigger, (Copy+Free+ equal)TriggerDesc, Relationbuild
function to add support an optional List of columns.
- change the pg_trigger system catalog to support the new column .
- change CreateTrigger() to perform some semantic analysis on the list of
columns (ensure no column names are duplicated,  ensure each name references
an extent and non-dropped column, and so forth)
- when deciding which triggers to invoke (executePlan() in execMain.c), add
logic to compare the list of columns in the  to-be-executed command with the
list of columns in any applicable columns,and only fire a trigger of the
column lists  that are appropriately compatible
-investigate the interaction between the column list and rules

I have spent the past four months on this and I have finished the YYpaser,
Catalog, trigger creation and some other support functions, I am working on
trigger execution right now. I expect the project will be completed by the
end of July. I would like to know your comments on my design and the
procedure of getting my work accepted.

Mark Wu



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