[CF 5679] Add comments about fire_triggers argument in ri_triggers.c

This branch was automatically generated by a robot using patches from an
email thread registered at:

https://commitfest.postgresql.org/patch/5679

The branch will be overwritten each time a new patch version is posted to
the thread, and also periodically to check for bitrot caused by changes
on the master branch.

Patch(es): https://www.postgresql.org/message-id/20250331212648.ad4ab804559001d7f0788741@sraoss.co.jp
Author(s): Yugo Nagata

Author: Commitfest Bot

src/backend/utils/adt/ri_triggers.c

@@ -2580,7 +2580,13 @@ ri_PerformCheck(const RI_ConstraintInfo *riinfo,
 						   save_sec_context | SECURITY_LOCAL_USERID_CHANGE |
 						   SECURITY_NOFORCE_RLS);
 
-	/* Finally we can run the query. */
+	/*
+	 * Finally we can run the query.
+	 *
+	 * Set fire_triggers to false so that AFTER triggers run at the end of
+	 * the query. This ensures check triggers fire after all RI updates on
+	 * the same row are complete.
+	 */
 	spi_result = SPI_execute_snapshot(qplan,
 									  vals, nulls,
 									  test_snapshot, crosscheck_snapshot,