Bug#20198490 : LOWER_CASE_TABLE_NAMES=0 ON WINDOWS LEADS TO

               PROBLEMS

Description:- Server variable "--lower_case_tables_names"
when set to "0" on windows platform which does not support
case sensitive file operations leads to problems. A warning
message is printed in the error log while starting the
server with "--lower_case_tables_names=0". Also according to
the documentation, seting "lower_case_tables_names" to "0"
on a case-insensitive filesystem might lead to index
corruption.

Analysis:- The problem reported in the bug is:-
Creating an INNODB table 'a' and executing a query, "INSERT
INTO a SELECT a FROM A;" on a server started with
"--lower_case_tables_names=0" and running on a
case-insensitive filesystem leads innodb to flat spin.
Optimizer thinks that "a" and "A" are two different tables
as the variable "lower_case_table_names" is set to "0". As a
result, optimizer comes up with a plan which does not need a
temporary table. If the same table is used in select and
insert, a temporary table is needed. This incorrect
optimizer plan leads to infinite insertions.

Fix:- If the server is started with
"--lower_case_tables_names" set to 0 on a case-insensitive
filesystem, an error, "The server option
'lower_case_table_names'is configured to use case sensitive
table names but the data directory is on a case-insensitive
file system which is an unsupported combination. Please
consider either using a case sensitive file system for your
data directory or switching to a case-insensitive table name
mode.", is printed in the server error log and the server
exits.

8 files changed, 16 insertions, 4 deletions

diff --git a/mysql-test/suite/jp/t/jp_enum_sjis-master.opt b/mysql-test/suite/jp/t/jp_enum_sjis-master.opt
deleted file mode 100644
index 9b27aef9bf8..00000000000
--- a/mysql-test/suite/jp/t/jp_enum_sjis-master.opt
+++ /dev/null
@@ -1 +0,0 @@
---lower_case_table_names=0
diff --git a/mysql-test/suite/jp/t/jp_enum_sjis.test b/mysql-test/suite/jp/t/jp_enum_sjis.test
index e1f22f6fe27..1060f83ec06 100644
--- a/mysql-test/suite/jp/t/jp_enum_sjis.test
+++ b/mysql-test/suite/jp/t/jp_enum_sjis.test
@@ -1,3 +1,7 @@
+#Server variable option 'lower_case_table_names' sets '0' as default value
+#in case sensitive filesystem. Using 'lower_case_table_names=0' in case of
+#insensitive filsystem is not allowed.
+-- source include/have_case_sensitive_file_system.inc
 --source include/have_sjis.inc
 --source include/have_innodb.inc
 --character_set sjis
diff --git a/mysql-test/suite/jp/t/jp_enum_ucs2-master.opt b/mysql-test/suite/jp/t/jp_enum_ucs2-master.opt
deleted file mode 100644
index 9b27aef9bf8..00000000000
--- a/mysql-test/suite/jp/t/jp_enum_ucs2-master.opt
+++ /dev/null
@@ -1 +0,0 @@
---lower_case_table_names=0
diff --git a/mysql-test/suite/jp/t/jp_enum_ucs2.test b/mysql-test/suite/jp/t/jp_enum_ucs2.test
index a3d7c47705d..321f8952148 100644
--- a/mysql-test/suite/jp/t/jp_enum_ucs2.test
+++ b/mysql-test/suite/jp/t/jp_enum_ucs2.test
@@ -1,3 +1,7 @@
+#Server variable option 'lower_case_table_names' sets '0' as default value
+#in case sensitive filesystem. Using 'lower_case_table_names=0' in case of
+#insensitive filsystem is not allowed.
+-- source include/have_case_sensitive_file_system.inc
 --source include/have_ucs2.inc
 --source include/have_innodb.inc
 
diff --git a/mysql-test/suite/jp/t/jp_enum_ujis-master.opt b/mysql-test/suite/jp/t/jp_enum_ujis-master.opt
deleted file mode 100644
index 9b27aef9bf8..00000000000
--- a/mysql-test/suite/jp/t/jp_enum_ujis-master.opt
+++ /dev/null
@@ -1 +0,0 @@
---lower_case_table_names=0
diff --git a/mysql-test/suite/jp/t/jp_enum_ujis.test b/mysql-test/suite/jp/t/jp_enum_ujis.test
index 17e41e0691e..10e8ad55a3c 100644
--- a/mysql-test/suite/jp/t/jp_enum_ujis.test
+++ b/mysql-test/suite/jp/t/jp_enum_ujis.test
@@ -1,3 +1,7 @@
+#Server variable option 'lower_case_table_names' sets '0' as default value
+#in case sensitive filesystem. Using 'lower_case_table_names=0' in case of
+#insensitive filsystem is not allowed.
+-- source include/have_case_sensitive_file_system.inc
 --source include/have_ujis.inc
 --source include/have_innodb.inc
 
diff --git a/mysql-test/suite/jp/t/jp_enum_utf8-master.opt b/mysql-test/suite/jp/t/jp_enum_utf8-master.opt
deleted file mode 100644
index 9b27aef9bf8..00000000000
--- a/mysql-test/suite/jp/t/jp_enum_utf8-master.opt
+++ /dev/null
@@ -1 +0,0 @@
---lower_case_table_names=0
diff --git a/mysql-test/suite/jp/t/jp_enum_utf8.test b/mysql-test/suite/jp/t/jp_enum_utf8.test
index ff5978da69c..f67939bd02b 100644
--- a/mysql-test/suite/jp/t/jp_enum_utf8.test
+++ b/mysql-test/suite/jp/t/jp_enum_utf8.test
@@ -1,3 +1,7 @@
+#Server variable option 'lower_case_table_names' sets '0' as default value
+#in case sensitive filesystem. Using 'lower_case_table_names=0' in case of
+#insensitive filsystem is not allowed.
+-- source include/have_case_sensitive_file_system.inc
 --source include/have_utf8.inc
 --source include/have_innodb.inc
 --disable_warnings