From be51d6ae8cff0e8a0974bbad3f0a840ebbc23cd9 Mon Sep 17 00:00:00 2001
From: "heikki@hundin.mysql.fi" <>
Date: Thu, 7 Nov 2002 15:05:26 +0200
Subject: [PATCH 1/2] row0mysql.c:   Backport from 4.0: Fix corruption of ON
 DELETE CASCADE in lock wait timeout

---
 innobase/row/row0mysql.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/innobase/row/row0mysql.c b/innobase/row/row0mysql.c
index 26878f8c97c..ebb3cbe8dc8 100644
--- a/innobase/row/row0mysql.c
+++ b/innobase/row/row0mysql.c
@@ -1000,8 +1000,8 @@ row_update_cascade_for_mysql(
 				or set null operation */
 	dict_table_t*	table)	/* in: table where we do the operation */
 {
-	ulint		err;
-	trx_t*		trx;
+	ulint	err;
+	trx_t*	trx;
 
 	trx = thr_get_trx(thr);
 run_again:
@@ -1012,11 +1012,26 @@ run_again:
 
 	err = trx->error_state;
 
-	if (err == DB_LOCK_WAIT) {
-		que_thr_stop_for_mysql(thr);
-	
-		row_mysql_handle_errors(&err, trx, thr, NULL);
+	/* Note that the cascade node is a subnode of another InnoDB
+	query graph node. We do a normal lock wait in this node, but
+	all errors are handled by the parent node. */
 
+	if (err == DB_LOCK_WAIT) {
+		/* Handle lock wait here */
+	
+		que_thr_stop_for_mysql(thr);
+
+		srv_suspend_mysql_thread(thr);
+
+		/* Note that a lock wait may also end in a lock wait timeout */
+
+		if (trx->error_state != DB_SUCCESS) {
+
+			return(trx->error_state);
+		}
+
+		/* Retry operation after a normal lock wait */
+		
 		goto run_again;
 	}
 

From 81503e476ade009fcfed2bb0d31e2615fcc1319e Mon Sep 17 00:00:00 2001
From: "monty@hundin.mysql.fi" <>
Date: Fri, 8 Nov 2002 09:58:28 +0200
Subject: [PATCH 2/2] Fixed rare core dump bug when using complicated GROUP BY
 query that didn't return any results. This only showed up under heavy load.

---
 sql/sql_select.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 0c3c19c6e69..3596fdc0c05 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -4970,6 +4970,8 @@ end_write_group(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
     }
     else
     {
+      if (end_of_records)
+	DBUG_RETURN(0);
       join->first_record=1;
       VOID(test_if_group_changed(join->group_fields));
     }