Fixes during review of new code

- Mostly indentation fixes
- Added missing test
- Ensure that Item_func_case() checks for stack overruns
- Use real_item() instead of (Item_ref*) item
- Fixed wrong error handling


myisam/mi_unique.c:
  Improved comments
myisam/myisampack.c:
  Updated version number
mysql-test/r/group_by.result:
  Added test that was lost during earlier merge
mysql-test/r/information_schema.result:
  Safety fix: Drop procedures before used
mysql-test/t/group_by.test:
  Added test that was lost during earlier merge
mysql-test/t/information_schema.test:
  Safety fix: Drop procedures before used
mysys/hash.c:
  Updated comment
sql/field.cc:
  false -> FALSE
sql/ha_ndbcluster.cc:
  Fix some style issues
  - No () around argument to 'case'
  - Space before ( in switch and if
  - Removed 'goto'
  - Added {}
  - Added () to make expressions easier to read
  - my_snprintf -> strmov
sql/handler.cc:
  if( -> if (
sql/item.cc:
  Indentation changes
sql/item.h:
  false -> FALSE
sql/item_cmpfunc.cc:
  Ensure that Item_func_case() check for stack overrun properly
sql/item_cmpfunc.h:
  Ensure that Item_func_case() check for stack overrun properly
sql/item_func.cc:
  Indentation fixes
  Fixed wrong goto label
sql/mysqld.cc:
  Remove test for opt_disable_networking as this flag can never be set here
sql/opt_range.cc:
  Simplify code
sql/sql_class.h:
  Move define out from middle of class definition
sql/sql_parse.cc:
  Remove extra empty lines
sql/sql_select.cc:
  use real_item() instead of (Item_ref*) item
  Modifed function comment to be align with others
  Simple optimization
sql/sql_union.cc:
  Portability fix:
  Don't use 'bool_variable|=...'
sql/sql_view.cc:
  Move List_iterator_fast out from loops (rewind is faster than creating a new itearator)
strings/ctype-utf8.c:
  if( -> if (
strings/ctype.c:
  Remove disabled code
strings/decimal.c:
  Indentation fixes
strings/xml.c:
  Indentation fixes

mysql-test/r/group_by.result

@@ -723,6 +723,27 @@ WHERE hostname LIKE '%aol%'
 hostname	no
 cache-dtc-af05.proxy.aol.com	1
 DROP TABLE t1;
+create table t1 (c1 char(3), c2 char(3));
+create table t2 (c3 char(3), c4 char(3));
+insert into t1 values ('aaa', 'bb1'), ('aaa', 'bb2');
+insert into t2 values ('aaa', 'bb1'), ('aaa', 'bb2');
+select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
+group by c2;
+c2
+aaa
+aaa
+Warnings:
+Warning	1052	Column 'c2' in group statement is ambiguous
+show warnings;
+Level	Code	Message
+Warning	1052	Column 'c2' in group statement is ambiguous
+select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
+group by t1.c1;
+c2
+aaa
+show warnings;
+Level	Code	Message
+drop table t1, t2;
 CREATE TABLE t1 (a  int, b int);
 INSERT INTO t1 VALUES (1,2), (1,3);
 SELECT a, b FROM t1 GROUP BY 'const';

mysql-test/r/information_schema.result

@@ -227,6 +227,9 @@ latin1_bin	latin1
 latin1_general_ci	latin1
 latin1_general_cs	latin1
 latin1_spanish_ci	latin1
+drop procedure if exists sel2;
+drop function if exists sub1;
+drop function if exists sub2;
 create function sub1(i int) returns int
 return i+1;
 create procedure sel2()
@@ -823,6 +826,8 @@ GRANT SELECT ON *.* TO 'user4'@'localhost'
 drop user user1@localhost, user2@localhost, user3@localhost, user4@localhost;
 use test;
 drop database mysqltest;
+drop procedure if exists p1;
+drop procedure if exists p2;
 create procedure p1 () modifies sql data set @a = 5;
 create procedure p2 () set @a = 5;
 select sql_data_access from information_schema.routines

mysql-test/t/group_by.test

@@ -542,6 +542,29 @@ SELECT hostname, COUNT(DISTINCT user_id) as no FROM t1
 
 DROP TABLE t1;
 
+#
+# Bug#11211: Ambiguous column reference in GROUP BY.
+#
+
+create table t1 (c1 char(3), c2 char(3));
+create table t2 (c3 char(3), c4 char(3));
+insert into t1 values ('aaa', 'bb1'), ('aaa', 'bb2');
+insert into t2 values ('aaa', 'bb1'), ('aaa', 'bb2');
+
+# query with ambiguous column reference 'c2'
+--disable_ps_protocol
+select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
+group by c2;
+show warnings;
+--enable_ps_protocol
+
+# this query has no ambiguity
+select t1.c1 as c2 from t1, t2 where t1.c2 = t2.c4
+group by t1.c1;
+
+show warnings;
+drop table t1, t2;
+
 #
 # Test for bug #8614: GROUP BY 'const' with DISTINCT  
 #

mysql-test/t/information_schema.test

@@ -101,6 +101,12 @@ where COLLATION_NAME like 'latin1%';
 # Test for information_schema.ROUTINES &
 #
 
+--disable_warnings
+drop procedure if exists sel2;
+drop function if exists sub1;
+drop function if exists sub2;
+--enable_warnings
+
 create function sub1(i int) returns int
   return i+1;
 delimiter |;
@@ -546,6 +552,11 @@ drop database mysqltest;
 #
 # Bug #11055 information_schema: routines.sql_data_access has wrong value
 #
+--disable_warnings
+drop procedure if exists p1;
+drop procedure if exists p2;
+--enable_warnings
+
 create procedure p1 () modifies sql data set @a = 5;
 create procedure p2 () set @a = 5;
 select sql_data_access from information_schema.routines