From 12eb6d88f70100e6da7a5931f99b661bba01737b Mon Sep 17 00:00:00 2001
From: Igor Babaev <igor@askmonty.org>
Date: Thu, 17 Apr 2014 12:53:53 -0700
Subject: [PATCH] Fixed the problem of mdev-5970: back-ported the patch for bug
 #13256831 from mysql-5.6 code line.

  Here's the comment this patch was provided with:

  Fixed bug#13256831 - ERROR 1032 (HY000): CAN'T FIND RECORD.

  This bug only occurs if a user tries to update a base table using
  an updatable view and this view was created as a join for which
  the clause 'WITH CHECK OPTION' was specified.

  The reason for the bug was that when such an update was
  executed, row positions were not properly handled for tables
  that were not updated but had constraints that had to be
  checked due to the 'WITH CHECK OPTION' clause.

  The reason for the bug was that when such update is executed
  then for tables specified in the view definition and
  also listed in the 'WITH CHECK OPTION' clause the positioning to
  row being updated is not performed.
---
 mysql-test/r/multi_update.result | 22 ++++++++++++++++++++++
 mysql-test/t/multi_update.test   | 26 ++++++++++++++++++++++++++
 sql/sql_update.cc                |  7 +++++++
 3 files changed, 55 insertions(+)

diff --git a/mysql-test/r/multi_update.result b/mysql-test/r/multi_update.result
index ff0aa828636..7fa9620f0e6 100644
--- a/mysql-test/r/multi_update.result
+++ b/mysql-test/r/multi_update.result
@@ -795,3 +795,25 @@ col_int_key	pk_1	pk_2	col_int
 1	7	11	4
 DROP TABLE t1,t2;
 end of 5.5 tests
+
+# Bug mdev-5970
+# Bug#13256831 - ERROR 1032 (HY000): CAN'T FIND RECORD
+
+CREATE TABLE t1 (f1 INT PRIMARY KEY, f2 INT) ENGINE=InnoDB;
+CREATE TABLE t2 (f1 INT PRIMARY KEY, f2 INT) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (5, 7);
+INSERT INTO t2 VALUES (6, 97);
+CREATE ALGORITHM = MERGE VIEW v1 AS 
+SELECT a2.f1 AS f1, a2.f2 AS f2
+FROM t1 AS a1 JOIN t2 AS a2 ON a1.f2 > a2.f1 
+WITH LOCAL CHECK OPTION;
+SELECT * FROM v1;
+f1	f2
+6	97
+UPDATE v1 SET f1 = 1;
+SELECT * FROM v1;
+f1	f2
+1	97
+DROP TABLE t1, t2;
+DROP VIEW v1;
+end of 10.0 tests
diff --git a/mysql-test/t/multi_update.test b/mysql-test/t/multi_update.test
index e0a35ca2bb9..78f0076f98c 100644
--- a/mysql-test/t/multi_update.test
+++ b/mysql-test/t/multi_update.test
@@ -810,3 +810,29 @@ DROP TABLE t1,t2;
 
 --echo end of 5.5 tests
 
+
+--source include/have_xtradb.inc
+
+--echo
+--echo # Bug mdev-5970
+--echo # Bug#13256831 - ERROR 1032 (HY000): CAN'T FIND RECORD
+--echo
+
+CREATE TABLE t1 (f1 INT PRIMARY KEY, f2 INT) ENGINE=InnoDB;
+CREATE TABLE t2 (f1 INT PRIMARY KEY, f2 INT) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (5, 7);
+INSERT INTO t2 VALUES (6, 97);
+
+CREATE ALGORITHM = MERGE VIEW v1 AS 
+SELECT a2.f1 AS f1, a2.f2 AS f2
+FROM t1 AS a1 JOIN t2 AS a2 ON a1.f2 > a2.f1 
+WITH LOCAL CHECK OPTION; 
+
+SELECT * FROM v1;
+UPDATE v1 SET f1 = 1;
+SELECT * FROM v1;
+
+DROP TABLE t1, t2;
+DROP VIEW v1;
+
+--echo end of 10.0 tests
diff --git a/sql/sql_update.cc b/sql/sql_update.cc
index 01fe0336814..8ad3a2950d7 100644
--- a/sql/sql_update.cc
+++ b/sql/sql_update.cc
@@ -1917,6 +1917,13 @@ loop_end:
     TABLE *tbl= table;
     do
     {
+      /*
+        Signal each table (including tables referenced by WITH CHECK OPTION
+        clause) for which we will store row position in the temporary table
+        that we need a position to be read first.
+      */
+      tbl->prepare_for_position();
+
       Field_string *field= new Field_string(tbl->file->ref_length, 0,
                                             tbl->alias.c_ptr(),
                                             &my_charset_bin);