From 68a22bc69df85cadd21ef6614de3a53d1df26384 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sat, 22 Jul 2017 20:20:10 -0400
Subject: [PATCH] Fix pg_dump's handling of event triggers.

pg_dump with the --clean option failed to emit DROP EVENT TRIGGER
commands for event triggers.  In a closely related oversight,
it also did not emit ALTER OWNER commands for event triggers.
Since only superusers can create event triggers, the latter oversight
is of little practical consequence ... but if we're going to record
an owner for event triggers, then surely pg_dump should preserve it.

Per complaint from Greg Atkins.  Back-patch to 9.3 where event triggers
were introduced.

Discussion: https://postgr.es/m/20170722191142.yi4e7tzcg3iacclg@gmail.com
---
 src/bin/pg_dump/pg_backup_archiver.c |  6 ++++--
 src/bin/pg_dump/pg_dump.c            | 14 ++++++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/src/bin/pg_dump/pg_backup_archiver.c b/src/bin/pg_dump/pg_backup_archiver.c
index c788e707ddd..d95f18479d1 100644
--- a/src/bin/pg_dump/pg_backup_archiver.c
+++ b/src/bin/pg_dump/pg_backup_archiver.c
@@ -2994,6 +2994,7 @@ _getObjectDescription(PQExpBuffer buf, TocEntry *te, ArchiveHandle *AH)
 	if (strcmp(type, "DATABASE") == 0 ||
 		strcmp(type, "PROCEDURAL LANGUAGE") == 0 ||
 		strcmp(type, "SCHEMA") == 0 ||
+		strcmp(type, "EVENT TRIGGER") == 0 ||
 		strcmp(type, "FOREIGN DATA WRAPPER") == 0 ||
 		strcmp(type, "SERVER") == 0 ||
 		strcmp(type, "USER MAPPING") == 0)
@@ -3037,7 +3038,7 @@ _getObjectDescription(PQExpBuffer buf, TocEntry *te, ArchiveHandle *AH)
 		return;
 	}
 
-	write_msg(modulename, "WARNING: don't know how to set owner for object type %s\n",
+	write_msg(modulename, "WARNING: don't know how to set owner for object type \"%s\"\n",
 			  type);
 }
 
@@ -3194,6 +3195,7 @@ _printTocEntry(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt, bool isDat
 			strcmp(te->desc, "OPERATOR FAMILY") == 0 ||
 			strcmp(te->desc, "PROCEDURAL LANGUAGE") == 0 ||
 			strcmp(te->desc, "SCHEMA") == 0 ||
+			strcmp(te->desc, "EVENT TRIGGER") == 0 ||
 			strcmp(te->desc, "TABLE") == 0 ||
 			strcmp(te->desc, "TYPE") == 0 ||
 			strcmp(te->desc, "VIEW") == 0 ||
@@ -3227,7 +3229,7 @@ _printTocEntry(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt, bool isDat
 		}
 		else
 		{
-			write_msg(modulename, "WARNING: don't know how to set owner for object type %s\n",
+			write_msg(modulename, "WARNING: don't know how to set owner for object type \"%s\"\n",
 					  te->desc);
 		}
 	}
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 2e433f13989..45142a1abb6 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -14496,6 +14496,7 @@ static void
 dumpEventTrigger(Archive *fout, EventTriggerInfo *evtinfo)
 {
 	PQExpBuffer query;
+	PQExpBuffer delqry;
 	PQExpBuffer labelq;
 
 	/* Skip if not to be dumped */
@@ -14503,6 +14504,7 @@ dumpEventTrigger(Archive *fout, EventTriggerInfo *evtinfo)
 		return;
 
 	query = createPQExpBuffer();
+	delqry = createPQExpBuffer();
 	labelq = createPQExpBuffer();
 
 	appendPQExpBuffer(query, "CREATE EVENT TRIGGER ");
@@ -14542,19 +14544,27 @@ dumpEventTrigger(Archive *fout, EventTriggerInfo *evtinfo)
 		}
 		appendPQExpBuffer(query, ";\n");
 	}
+
+	appendPQExpBuffer(delqry, "DROP EVENT TRIGGER %s;\n",
+					  fmtId(evtinfo->dobj.name));
+
 	appendPQExpBuffer(labelq, "EVENT TRIGGER %s",
 					  fmtId(evtinfo->dobj.name));
 
 	ArchiveEntry(fout, evtinfo->dobj.catId, evtinfo->dobj.dumpId,
-				 evtinfo->dobj.name, NULL, NULL, evtinfo->evtowner, false,
+				 evtinfo->dobj.name, NULL, NULL,
+				 evtinfo->evtowner, false,
 				 "EVENT TRIGGER", SECTION_POST_DATA,
-				 query->data, "", NULL, NULL, 0, NULL, NULL);
+				 query->data, delqry->data, NULL,
+				 NULL, 0,
+				 NULL, NULL);
 
 	dumpComment(fout, labelq->data,
 				NULL, evtinfo->evtowner,
 				evtinfo->dobj.catId, 0, evtinfo->dobj.dumpId);
 
 	destroyPQExpBuffer(query);
+	destroyPQExpBuffer(delqry);
 	destroyPQExpBuffer(labelq);
 }