Merge

BitKeeper/etc/logging_ok:
  auto-union
BitKeeper/triggers/post-commit:
  Auto merged
include/my_pthread.h:
  Auto merged
mysql-test/r/select.result:
  Auto merged
mysql-test/t/select.test:
  Auto merged
sql/item.cc:
  Auto merged
sql/log.cc:
  Auto merged
sql/table.cc:
  SCCS merged

2 files changed, 28 insertions, 0 deletions

diff --git a/mysql-test/r/select.result b/mysql-test/r/select.result
index b72754d3374..06b72b993ff 100644
--- a/mysql-test/r/select.result
+++ b/mysql-test/r/select.result
@@ -2388,3 +2388,16 @@ WART	0100	1
 WART	0200	1
 WART	0300	3
 DROP TABLE t1;
+CREATE TABLE t1 ( a BLOB, INDEX (a(20)) );
+CREATE TABLE t2 ( a BLOB, INDEX (a(20)) );
+INSERT INTO t1 VALUES ('one'),('two'),('three'),('four'),('five');
+INSERT INTO t2 VALUES ('one'),('two'),('three'),('four'),('five');
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 USE INDEX (a) ON t1.a=t2.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ref	a	a	23	test.t1.a	2	
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 FORCE INDEX (a) ON t1.a=t2.a;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
+1	SIMPLE	t2	ref	a	a	23	test.t1.a	2	
+DROP TABLE t1, t2;
diff --git a/mysql-test/t/select.test b/mysql-test/t/select.test
index a32b9d06ef9..13b3e792055 100644
--- a/mysql-test/t/select.test
+++ b/mysql-test/t/select.test
@@ -1970,3 +1970,18 @@ SELECT K2C4, K4N4, F2I4 FROM t1
   WHERE  K2C4 = 'WART' AND (K2C4 = 'WART' OR K4N4 = '0200');
 
 DROP TABLE t1;
+
+#
+# Test case for bug 7520: a wrong cost of the index for a BLOB field
+#
+
+CREATE TABLE t1 ( a BLOB, INDEX (a(20)) );
+CREATE TABLE t2 ( a BLOB, INDEX (a(20)) );
+
+INSERT INTO t1 VALUES ('one'),('two'),('three'),('four'),('five');
+INSERT INTO t2 VALUES ('one'),('two'),('three'),('four'),('five');
+
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 USE INDEX (a) ON t1.a=t2.a;
+EXPLAIN SELECT * FROM t1 LEFT JOIN t2 FORCE INDEX (a) ON t1.a=t2.a;
+
+DROP TABLE t1, t2;