Fixed that NULL and 0 returns 0 instead of NULL

This is coded to not cause a speed impact on top level AND expressions where we don't care if an AND expression returns 0 or NULL


mysql-test/r/bdb.result:
  Fix results after serges last patch
mysql-test/r/innodb.result:
  Fix results after serges last patch
mysql-test/r/null.result:
  Update for new AND handling of NULL
scripts/mysqld_safe.sh:
  Fix 'isroot' test to work even if user is not root
sql/item.h:
  Fixed that NULL and 0 returns 0 instead of NULL
sql/item_cmpfunc.cc:
  Fixed that NULL and 0 returns 0 instead of NULL
sql/item_cmpfunc.h:
  Fixed that NULL and 0 returns 0 instead of NULL
sql/sql_base.cc:
  Fixed that NULL and 0 returns 0 instead of NULL
sql/sql_parse.cc:
  Fixed that NULL and 0 returns 0 instead of NULL
sql/sql_select.cc:
  Fixed that NULL and 0 returns 0 instead of NULL
sql/sql_yacc.yy:
  Fixed that NULL and 0 returns 0 instead of NULL

4 files changed, 54 insertions, 6 deletions

diff --git a/mysql-test/r/bdb.result b/mysql-test/r/bdb.result
index e52878b9759..a815f2f8fab 100644
--- a/mysql-test/r/bdb.result
+++ b/mysql-test/r/bdb.result
@@ -203,7 +203,7 @@ a
 2
 check table t1;
 Table	Op	Msg_type	Msg_text
-test.t1	check	error	The handler for the table doesn't support check/repair
+test.t1	check	error	The handler for the table doesn't support check
 drop table t1;
 create table t1 (a int,b varchar(20)) type=bdb;
 insert into t1 values (1,""), (2,"testing");
diff --git a/mysql-test/r/bool.result b/mysql-test/r/bool.result
new file mode 100644
index 00000000000..dc170ee5150
--- /dev/null
+++ b/mysql-test/r/bool.result
@@ -0,0 +1,48 @@
+DROP TABLE IF EXISTS t1;
+SELECT IF(NULL AND 1, 1, 2), IF(1 AND NULL, 1, 2);
+IF(NULL AND 1, 1, 2)	IF(1 AND NULL, 1, 2)
+2	2
+SELECT NULL AND 1, 1 AND NULL, 0 AND NULL, NULL and 0;
+NULL AND 1	1 AND NULL	0 AND NULL	NULL and 0
+NULL	NULL	0	0
+create table t1 (a int);
+insert into t1 values (0),(1),(NULL);
+SELECT * FROM t1 WHERE IF(a AND 1, 0, 1);
+a
+0
+NULL
+SELECT * FROM t1 WHERE IF(1 AND a, 0, 1);
+a
+0
+NULL
+SELECT * FROM t1 where NOT(a AND 1);
+a
+0
+SELECT * FROM t1 where NOT(1 AND a);
+a
+0
+SELECT * FROM t1 where (a AND 1)=0;
+a
+0
+SELECT * FROM t1 where (1 AND a)=0;
+a
+0
+SELECT * FROM t1 where (1 AND a)=1;
+a
+1
+SELECT * FROM t1 where (1 AND a) IS NULL;
+a
+NULL
+SET @a=0, @b=0;
+SELECT * FROM t1 WHERE NULL AND (@a:=@a+1);
+a
+SELECT * FROM t1 WHERE NOT(a>=0 AND NULL AND (@b:=@b+1));
+a
+SELECT * FROM t1 WHERE a=2 OR (NULL AND (@a:=@a+1));
+a
+SELECT * FROM t1 WHERE NOT(a=2 OR (NULL AND (@b:=@b+1)));
+a
+SELECT @a, @b;
+@a	@b
+0	6
+DROP TABLE t1;
diff --git a/mysql-test/r/innodb.result b/mysql-test/r/innodb.result
index 62f5734a217..67c78f34392 100644
--- a/mysql-test/r/innodb.result
+++ b/mysql-test/r/innodb.result
@@ -165,7 +165,7 @@ level	id	parent_id
 1	1007	101
 optimize table t1;
 Table	Op	Msg_type	Msg_text
-test.t1	optimize	error	The handler for the table doesn't support check/repair
+test.t1	optimize	error	The handler for the table doesn't support optimize
 show keys from t1;
 Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
 t1	0	PRIMARY	1	id	A	87	NULL	NULL		BTREE	
@@ -189,7 +189,7 @@ create table t1 (a int) type=innodb;
 insert into t1 values (1), (2);
 optimize table t1;
 Table	Op	Msg_type	Msg_text
-test.t1	optimize	error	The handler for the table doesn't support check/repair
+test.t1	optimize	error	The handler for the table doesn't support optimize
 delete from t1 where a = 1;
 select * from t1;
 a
@@ -208,7 +208,7 @@ create index skr on t1 (a);
 insert into t1 values (3,""), (4,"testing");
 analyze table t1;
 Table	Op	Msg_type	Msg_text
-test.t1	analyze	error	The handler for the table doesn't support check/repair
+test.t1	analyze	error	The handler for the table doesn't support analyze
 show keys from t1;
 Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
 t1	1	skr	1	a	A	3	NULL	NULL	YES	BTREE	
@@ -724,7 +724,7 @@ world	2
 hello	1
 optimize table t1;
 Table	Op	Msg_type	Msg_text
-test.t1	optimize	error	The handler for the table doesn't support check/repair
+test.t1	optimize	error	The handler for the table doesn't support optimize
 show keys from t1;
 Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
 t1	0	PRIMARY	1	a	A	2	NULL	NULL		BTREE	
diff --git a/mysql-test/r/null.result b/mysql-test/r/null.result
index e6e3b7155a3..07724a56025 100644
--- a/mysql-test/r/null.result
+++ b/mysql-test/r/null.result
@@ -30,7 +30,7 @@ SELECT (NULL OR NULL) IS NULL;
 1
 select NULL AND 0, 0 and NULL;
 NULL AND 0	0 and NULL
-NULL	0
+0	0
 select inet_ntoa(null),inet_aton(null),inet_aton("122.256"),inet_aton("122.226."),inet_aton("");
 inet_ntoa(null)	inet_aton(null)	inet_aton("122.256")	inet_aton("122.226.")	inet_aton("")
 NULL	NULL	NULL	NULL	NULL