From 447eff2d98af4bd229f71e109ae568d4155c30cf Mon Sep 17 00:00:00 2001
From: "gkodinov/kgeorge@magare.gmz" <>
Date: Thu, 1 Nov 2007 14:42:14 +0200
Subject: [PATCH] Bug #31866: MySQL Server crashes on SHOW CREATE TRIGGER
 statement

SHOW CREATE TRIGGER was not checking for detected errors
opening/reading the trigger file.
Fixed to return the already generated error.
---
 mysql-test/r/trigger.result |  6 ++++++
 mysql-test/t/trigger.test   | 12 ++++++++++++
 sql/sql_show.cc             |  3 +++
 3 files changed, 21 insertions(+)

diff --git a/mysql-test/r/trigger.result b/mysql-test/r/trigger.result
index 189722bfe9b..47ffc90e3cd 100644
--- a/mysql-test/r/trigger.result
+++ b/mysql-test/r/trigger.result
@@ -1978,3 +1978,9 @@ a
 1
 drop table table_25411_a;
 drop table table_25411_b;
+DROP TRIGGER IF EXISTS trg;
+Warnings:
+Note	1360	Trigger does not exist
+SHOW CREATE TRIGGER trg;
+ERROR HY000: Trigger does not exist
+End of 5.1 tests.
diff --git a/mysql-test/t/trigger.test b/mysql-test/t/trigger.test
index 9f4634e1e17..1c98a0f8d29 100644
--- a/mysql-test/t/trigger.test
+++ b/mysql-test/t/trigger.test
@@ -2246,3 +2246,15 @@ select * from table_25411_a;
 drop table table_25411_a;
 drop table table_25411_b;
 
+#
+# Bug #31866: MySQL Server crashes on SHOW CREATE TRIGGER statement
+#
+
+--disable-warnings
+DROP TRIGGER IF EXISTS trg;
+--enable-warnings
+
+--error ER_TRG_DOES_NOT_EXIST
+SHOW CREATE TRIGGER trg;
+
+--echo End of 5.1 tests.
diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index 049c050c288..1969472dff4 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -6862,6 +6862,9 @@ bool show_create_trigger(THD *thd, const sp_name *trg_name)
 {
   TABLE_LIST *lst= get_trigger_table(thd, trg_name);
 
+  if (!lst)
+    return TRUE;
+
   /*
     Open the table by name in order to load Table_triggers_list object.