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

Author: tglsfdc

src/bin/pg_dump/pg_backup_archiver.c

@@ -3267,6 +3267,7 @@ _getObjectDescription(PQExpBuffer buf, TocEntry *te, ArchiveHandle *AH)
 		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)
@@ -3311,7 +3312,7 @@ _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);
 }
 
@@ -3470,6 +3471,7 @@ _printTocEntry(ArchiveHandle *AH, TocEntry *te, bool isData, bool acl_pass)
 			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 ||
@@ -3505,7 +3507,7 @@ _printTocEntry(ArchiveHandle *AH, TocEntry *te, bool isData, bool acl_pass)
 		}
 		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);
 		}
 	}

src/bin/pg_dump/pg_dump.c

@@ -16978,13 +16978,15 @@ dumpEventTrigger(Archive *fout, EventTriggerInfo *evtinfo)
 {
 	DumpOptions *dopt = fout->dopt;
 	PQExpBuffer query;
+	PQExpBuffer delqry;
 	PQExpBuffer labelq;
 
 	/* Skip if not to be dumped */
 	if (!evtinfo->dobj.dump || dopt->dataOnly)
 		return;
 
 	query = createPQExpBuffer();
+	delqry = createPQExpBuffer();
 	labelq = createPQExpBuffer();
 
 	appendPQExpBufferStr(query, "CREATE EVENT TRIGGER ");
@@ -17024,21 +17026,29 @@ dumpEventTrigger(Archive *fout, EventTriggerInfo *evtinfo)
 		}
 		appendPQExpBufferStr(query, ";\n");
 	}
+
+	appendPQExpBuffer(delqry, "DROP EVENT TRIGGER %s;\n",
+					  fmtId(evtinfo->dobj.name));
+
 	appendPQExpBuffer(labelq, "EVENT TRIGGER %s",
 					  fmtId(evtinfo->dobj.name));
 
 	if (evtinfo->dobj.dump & DUMP_COMPONENT_DEFINITION)
 		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);
 
 	if (evtinfo->dobj.dump & DUMP_COMPONENT_COMMENT)
 		dumpComment(fout, labelq->data,
 					NULL, evtinfo->evtowner,
 					evtinfo->dobj.catId, 0, evtinfo->dobj.dumpId);
 
 	destroyPQExpBuffer(query);
+	destroyPQExpBuffer(delqry);
 	destroyPQExpBuffer(labelq);
 }
 

src/bin/pg_dump/t/002_pg_dump.pl

@@ -516,18 +516,19 @@
 			only_dump_test_table   => 1,
 			test_schema_plus_blobs => 1, }, },
 
-	# catch-all for ALTER ... OWNER (except LARGE OBJECTs)
-	'ALTER ... OWNER commands (except LARGE OBJECTs)' => {
-		regexp => qr/^ALTER (?!LARGE OBJECT)(.*) OWNER TO .*;/m,
+	# catch-all for ALTER ... OWNER (except post-data objects)
+	'ALTER ... OWNER commands (except post-data objects)' => {
+		regexp => qr/^ALTER (?!EVENT TRIGGER|LARGE OBJECT)(.*) OWNER TO .*;/m,
 		like   => {},    # use more-specific options above
 		unlike => {
 			column_inserts => 1,
 			data_only      => 1,
-			section_data   => 1, }, },
+			section_data   => 1,
+			section_post_data => 1, }, },
 
-	# catch-all for ALTER TABLE ...
+	# catch-all for ALTER TABLE ... (except OWNER TO)
 	'ALTER TABLE ... commands' => {
-		regexp => qr/^ALTER TABLE .*;/m,
+		regexp => qr/^ALTER TABLE .* (?!OWNER TO)(.*);/m,
 		like   => {},                      # use more-specific options above
 		unlike => {
 			column_inserts           => 1,
@@ -543,8 +544,7 @@
 		unlike => {
 			no_owner                 => 1,
 			pg_dumpall_globals       => 1,
-			pg_dumpall_globals_clean => 1,
-			section_post_data        => 1, }, },
+			pg_dumpall_globals_clean => 1, }, },
 
 	#	'BLOB load (contents are of test_table)' => {
 	#		create_order => 14,