Re: sql_drop Event Triggerg

Alvaro Herrera escribió:

> However, I think previous discussions have conflated many different
> things, and we've been slowly fixing them one by one; so perhaps at this
> point it does make sense to have a new object-drop event.  Let's discuss
> it -- we would define it as taking place just before ddl_command_end,
> and firing any time a command (with matching tag?) has called
> performDeletion or performMultipleDeletions.  Does that sound okay?

Here's another version of this patch.  I hope this is really final now
... but then, that's what I thought of the previous two versions, too.

I have re-instated event sql_drop, which takes place just before
ddl_command_end, and is called a single time per command (not once per
object dropped, as the old definition would have had it).  Within a
function running in that event, you can call
pg_event_trigger_dropped_object(); that will give you a list of all
objects that have been dropped.  Since the deletion command has already
been run, the objects are not in catalogs anymore.  There are no magic
TG_* variables about objects deleted.  I'm a bit unhappy about having to
add calls to EventTriggerSQLDrop() just before each call to
EventTriggerDDLCommandEnd(), but I didn't see any way to make this less
duplicative.

Docs and regression tests have been minimally fixed.

The new event is called sql_drop, note.

-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
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