From: Date: October 27 2006 7:23pm
Subject: bk commit into 4.1 tree (svoj:1.2534) BUG#18036
List-Archive: http://lists.mysql.com/commits/14499
X-Bug: 18036
Message-Id: <20061027172314.58C8AB28@april.pils.ru>

Below is the list of changes that have just been committed into a local
4.1 repository of svoj. When svoj does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet@stripped, 2006-10-27 22:23:10+05:00, svoj@stripped +3 -0
  BUG#21310 - Trees in SQL causing a "crashed" table with MyISAM storage engine
  
  An update that used a join of a table to itself and modified the
  table on one side of the join reported the table as crashed.
  
  This problem was introduced with fix for BUG#18036.
  
  Do not rely on (tables_to_update & table->map) while determining whether to use
  record cache for self-joined table updates. It must be disabled for both:
  table that is opened for reading and table that is opened for writing.

  mysql-test/r/myisam.result@stripped, 2006-10-27 22:01:52+05:00, svoj@stripped +8 -0
    A test case for BUG#21310.

  mysql-test/t/myisam.test@stripped, 2006-10-27 22:01:09+05:00, svoj@stripped +10 -0
    A test case for BUG#21310.

  sql/sql_update.cc@stripped, 2006-10-27 22:03:45+05:00, svoj@stripped +1 -2
    Do not rely on (tables_to_update & table->map) while determining whether to use
    record cache for self-joined table updates. It must be disabled for both:
    table that is opened for reading and table that is opened for writing.

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	svoj
# Host:	april.(none)
# Root:	/home/svoj/devel/mysql/BUG21310/mysql-4.1-engines

--- 1.157/sql/sql_update.cc	2006-10-27 22:23:14 +05:00
+++ 1.158/sql/sql_update.cc	2006-10-27 22:23:14 +05:00
@@ -862,8 +862,7 @@ int multi_update::prepare(List<Item> &no
   for (table_ref= all_tables;  table_ref; table_ref=table_ref->next)
   {
     TABLE *table=table_ref->table;
-    if ((tables_to_update & table->map) && 
-	mysql_lock_have_duplicate(thd, table, update_tables))
+    if (mysql_lock_have_duplicate(thd, table, update_tables))
       table->no_cache= 1;			// Disable row cache
   }
   DBUG_RETURN(thd->is_fatal_error != 0);

--- 1.68/mysql-test/r/myisam.result	2006-10-27 22:23:14 +05:00
+++ 1.69/mysql-test/r/myisam.result	2006-10-27 22:23:14 +05:00
@@ -944,3 +944,11 @@ select * from t1;
 a
 42
 drop table t1;
+CREATE TABLE t1(a VARCHAR(16));
+INSERT INTO t1 VALUES('aaaaaaaa'),(NULL);
+UPDATE t1 AS ta1, t1 AS ta2 SET ta1.a='aaaaaaaaaaaaaaaa';
+SELECT * FROM t1;
+a
+aaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaa
+DROP TABLE t1;

--- 1.54/mysql-test/t/myisam.test	2006-10-27 22:23:14 +05:00
+++ 1.55/mysql-test/t/myisam.test	2006-10-27 22:23:14 +05:00
@@ -890,4 +890,14 @@ connection default;
 select * from t1;
 drop table t1;
 
+#
+# BUG#21310 - Trees in SQL causing a "crashed" table with MyISAM storage
+#             engine
+#
+CREATE TABLE t1(a VARCHAR(16));
+INSERT INTO t1 VALUES('aaaaaaaa'),(NULL);
+UPDATE t1 AS ta1, t1 AS ta2 SET ta1.a='aaaaaaaaaaaaaaaa';
+SELECT * FROM t1;
+DROP TABLE t1;
+
 # End of 4.1 tests