Merge

client/mysql.cc:
  Auto merged
include/mysql.h:
  Auto merged
include/violite.h:
  Auto merged
libmysqld/lib_sql.cc:
  Auto merged
sql/field.cc:
  Auto merged
sql/ha_berkeley.cc:
  Auto merged
sql/ha_innodb.cc:
  Auto merged
sql/item.cc:
  Auto merged
sql/item_cmpfunc.cc:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/item_strfunc.cc:
  Auto merged
sql/item_sum.cc:
  Auto merged
sql/log.cc:
  Auto merged
sql/log_event.cc:
  Auto merged
sql/mf_iocache.cc:
  Auto merged
sql/mysql_priv.h:
  Auto merged
sql/mysqld.cc:
  Auto merged
sql/opt_range.cc:
  Auto merged
sql/set_var.cc:
  Auto merged
sql/slave.cc:
  Auto merged
sql/sql_acl.cc:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_cache.cc:
  Auto merged
sql/sql_class.cc:
  Auto merged
sql/sql_handler.cc:
  Auto merged
sql/sql_help.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged
sql/sql_prepare.cc:
  Auto merged
sql/sql_repl.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
sql/sql_table.cc:
  Auto merged
sql/sql_yacc.yy:
  Auto merged
sql/protocol.cc:
  SCCS merged

4 files changed, 26 insertions, 6 deletions

diff --git a/mysql-test/r/explain.result b/mysql-test/r/explain.result
index 2892c2ea587..ff38e9fae7d 100644
--- a/mysql-test/r/explain.result
+++ b/mysql-test/r/explain.result
@@ -1,5 +1,8 @@
 drop table if exists t1;
 create table t1 (id int not null, str char(10), unique(str));
+explain select * from t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	0	const row not found
 insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
 select * from t1 where str is null;
 id	str
diff --git a/mysql-test/r/join.result b/mysql-test/r/join.result
index 96113dcdc8b..6649c480d7b 100644
--- a/mysql-test/r/join.result
+++ b/mysql-test/r/join.result
@@ -14,8 +14,7 @@ insert into t1 values (101);
 insert into t1 values (105);
 insert into t1 values (106);
 insert into t1 values (107);
-insert into t2 values (107);
-insert into t2 values (75);
+insert into t2 values (107),(75),(1000);
 select t1.id, t2.id from t1, t2 where t2.id = t1.id;
 id	id
 107	107
@@ -28,6 +27,16 @@ select t1.id, count(t2.id) from t1,t2 where t2.id = t1.id group by t2.id;
 id	count(t2.id)
 75	1
 107	1
+select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0 where t2.id=75 and t1.id is null;
+id	id
+NULL	75
+explain select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0 where t2.id=75 and t1.id is null;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	const	PRIMARY	NULL	NULL	NULL	1	Impossible ON condition
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
+explain select t1.id, t2.id from t1, t2 where t2.id = t1.id and t1.id <0 and t1.id > 0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 drop table t1,t2;
 CREATE TABLE t1 (
 id int(11) NOT NULL auto_increment,
diff --git a/mysql-test/t/explain.test b/mysql-test/t/explain.test
index 3e33d58215e..1cf8c5e93e1 100644
--- a/mysql-test/t/explain.test
+++ b/mysql-test/t/explain.test
@@ -5,6 +5,7 @@
 drop table if exists t1;
 --enable_warnings
 create table t1 (id int not null, str char(10), unique(str));
+explain select * from t1;
 insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
 select * from t1 where str is null;
 select * from t1 where str="foo";
@@ -14,8 +15,10 @@ explain select * from t1 ignore key (str) where str="foo";
 explain select * from t1 use key (str,str) where str="foo";
 
 #The following should give errors
-!$1072 explain select * from t1 use key (str,str,foo) where str="foo";
-!$1072 explain select * from t1 ignore key (str,str,foo) where str="foo";
+--error 1072
+explain select * from t1 use key (str,str,foo) where str="foo";
+--error 1072
+explain select * from t1 ignore key (str,str,foo) where str="foo";
 drop table t1;
 
 explain select 1;
diff --git a/mysql-test/t/join.test b/mysql-test/t/join.test
index 653b4271fe8..2a3b8488ca0 100644
--- a/mysql-test/t/join.test
+++ b/mysql-test/t/join.test
@@ -21,13 +21,18 @@ insert into t1 values (105);
 insert into t1 values (106);
 insert into t1 values (107);
 
-insert into t2 values (107);
-insert into t2 values (75);
+insert into t2 values (107),(75),(1000);
 
 select t1.id, t2.id from t1, t2 where t2.id = t1.id;
 select t1.id, count(t2.id) from t1,t2 where t2.id = t1.id group by t1.id;
 select t1.id, count(t2.id) from t1,t2 where t2.id = t1.id group by t2.id;
 
+#
+# Test problems with impossible ON or WHERE
+#
+select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0 where t2.id=75 and t1.id is null;
+explain select t1.id,t2.id from t2 left join t1 on t1.id>=74 and t1.id<=0 where t2.id=75 and t1.id is null;
+explain select t1.id, t2.id from t1, t2 where t2.id = t1.id and t1.id <0 and t1.id > 0;
 drop table t1,t2;
 
 #