bzr commit into mysql-5.1 branch (mattias.jonsson:2708) Bug#40954

[Mattias Jonsson]

#At file:///Users/mattiasj/clones/bzrroot/b40954-51-bugteam/

 2708 Mattias Jonsson	2008-11-24
      Bug#40954: Crash in MyISAM index code with concurrency test using partitioned tables
      
      Problem was usage of read_range_first with an empty key.
      
      Solution was to not to give a key if it was empty.
modified:
  mysql-test/r/partition.result
  mysql-test/t/partition.test
  sql/ha_partition.cc

per-file messages:
  mysql-test/r/partition.result
    Bug#40954: Crash in MyISAM index code with concurrency test using partitioned tables
    
    Updated test result.
  mysql-test/t/partition.test
    Bug#40954: Crash in MyISAM index code with concurrency test using partitioned tables
    
    Added test case
  sql/ha_partition.cc
    Bug#40954: Crash in MyISAM index code with concurrency test using partitioned tables
    
    Problem was usage of read_range_first with an empty key.
    
    Solution was to not to give a key if it was empty.
=== modified file 'mysql-test/r/partition.result'
--- a/mysql-test/r/partition.result	2008-11-06 14:18:25 +0000
+++ b/mysql-test/r/partition.result	2008-11-24 16:24:03 +0000
@@ -1,4 +1,16 @@
 drop table if exists t1, t2;
+CREATE TABLE t1 (
+pk INT NOT NULL AUTO_INCREMENT,
+PRIMARY KEY (pk)
+)
+/*!50100 PARTITION BY HASH (pk)
+PARTITIONS 2 */;
+INSERT INTO t1 VALUES (NULL);
+INSERT INTO t1 VALUES (NULL);
+INSERT INTO t1 VALUES (NULL);
+SELECT * FROM t1 WHERE pk < 0 ORDER BY pk;
+pk
+DROP TABLE t1;
 CREATE TABLE t1 (a INT NOT NULL, KEY(a))
 PARTITION BY RANGE(a)
 (PARTITION p1 VALUES LESS THAN (200), PARTITION pmax VALUES LESS THAN MAXVALUE);

=== modified file 'mysql-test/t/partition.test'
--- a/mysql-test/t/partition.test	2008-11-06 14:18:25 +0000
+++ b/mysql-test/t/partition.test	2008-11-24 16:24:03 +0000
@@ -15,6 +15,21 @@ drop table if exists t1, t2;
 --enable_warnings
 
 #
+# Bug#40954: Crash if range search and order by.
+#
+CREATE TABLE t1 (
+  pk INT NOT NULL AUTO_INCREMENT,
+  PRIMARY KEY (pk)
+)
+/*!50100 PARTITION BY HASH (pk)
+PARTITIONS 2 */;
+INSERT INTO t1 VALUES (NULL);
+INSERT INTO t1 VALUES (NULL);
+INSERT INTO t1 VALUES (NULL);
+SELECT * FROM t1 WHERE pk < 0 ORDER BY pk;
+DROP TABLE t1;
+
+#
 # Bug#40494: Crash MYSQL server crashes on range access with partitioning
 #            and order by
 #

=== modified file 'sql/ha_partition.cc'
--- a/sql/ha_partition.cc	2008-11-10 20:13:24 +0000
+++ b/sql/ha_partition.cc	2008-11-24 16:24:03 +0000
@@ -4490,7 +4490,8 @@ int ha_partition::handle_ordered_index_s
         This can only read record to table->record[0], as it was set when
         the table was being opened. We have to memcpy data ourselves.
       */
-      error= file->read_range_first(&m_start_key, end_range, eq_range, TRUE);
+      error= file->read_range_first(m_start_key.key? &m_start_key: NULL,
+                                    end_range, eq_range, TRUE);
       memcpy(rec_buf_ptr, table->record[0], m_rec_length);
       reverse_order= FALSE;
       break;