Make new event trigger facility actually do something.

Commit 3855968f328918b6cd1401dd11d109d471a54d40 added syntax, pg_dump,
psql support, and documentation, but the triggers didn't actually fire.
With this commit, they now do.  This is still a pretty basic facility
overall because event triggers do not get a whole lot of information
about what the user is trying to do unless you write them in C; and
there's still no option to fire them anywhere except at the very
beginning of the execution sequence, but it's better than nothing,
and a good building block for future work.

Along the way, add a regression test for ALTER LARGE OBJECT, since
testing of event triggers reveals that we haven't got one.

Dimitri Fontaine and Robert Haas

1 files changed, 14 insertions, 6 deletions

diff --git a/src/include/tcop/utility.h b/src/include/tcop/utility.h
index 54190b2f6c..fb6b568809 100644
--- a/src/include/tcop/utility.h
+++ b/src/include/tcop/utility.h
@@ -16,19 +16,27 @@
 
 #include "tcop/tcopprot.h"
 
+typedef enum
+{
+	PROCESS_UTILITY_TOPLEVEL,		/* toplevel interactive command */
+	PROCESS_UTILITY_QUERY,			/* a complete query, but not toplevel */
+	PROCESS_UTILITY_SUBCOMMAND,		/* a piece of a query */
+	PROCESS_UTILITY_GENERATED		/* internally generated node query node */
+} ProcessUtilityContext;
 
 /* Hook for plugins to get control in ProcessUtility() */
 typedef void (*ProcessUtility_hook_type) (Node *parsetree,
-			  const char *queryString, ParamListInfo params, bool isTopLevel,
-									DestReceiver *dest, char *completionTag);
+			  const char *queryString, ParamListInfo params,
+			  DestReceiver *dest, char *completionTag,
+			  ProcessUtilityContext context);
 extern PGDLLIMPORT ProcessUtility_hook_type ProcessUtility_hook;
 
 extern void ProcessUtility(Node *parsetree, const char *queryString,
-			   ParamListInfo params, bool isTopLevel,
-			   DestReceiver *dest, char *completionTag);
+			   ParamListInfo params, DestReceiver *dest, char *completionTag,
+			   ProcessUtilityContext context);
 extern void standard_ProcessUtility(Node *parsetree, const char *queryString,
-						ParamListInfo params, bool isTopLevel,
-						DestReceiver *dest, char *completionTag);
+						ParamListInfo params, DestReceiver *dest,
+						char *completionTag, ProcessUtilityContext context);
 
 extern bool UtilityReturnsTuples(Node *parsetree);