Fix for bug #11759990 - "52354: 'CREATE TABLE .. LIKE ... '

STATEMENTS FAIL".

Attempt to execute CREATE TABLE LIKE statement on a MyISAM
table with INDEX or DATA DIRECTORY options specified as a
source resulted in "MyISAM table '...' is in use..." error.
According to our documentation such a statement should create
a copy of source table with DATA/INDEX DIRECTORY options
omitted.

The problem was that new implementation of CREATE TABLE LIKE
statement in 5.5 tried to copy value of INDEX and DATA DIRECTORY
parameters from the source table. Since in description of source
table this parameters also included name of this table, attempt
to create target table with these parameter led to file name
conflict and error.

This fix addresses the problem by preserving documented and
backward-compatible behavior. I.e. by ensuring that contents
of DATA/INDEX DIRECTORY clauses for the source table is
ignored when target table is created.

mysql-test/r/symlink.result:
  Added test for bug #11759990 - "52354: 'CREATE TABLE ..
  LIKE ... ' STATEMENTS FAIL".
mysql-test/t/symlink.test:
  Added test for bug #11759990 - "52354: 'CREATE TABLE ..
  LIKE ... ' STATEMENTS FAIL".
sql/sql_table.cc:
  Changed CREATE TABLE LIKE implementation to ignore contents
  of DATA/INDEX DIRECTORY clauses for source table when target
  table is created. This is documented and backward-compatible
  behavior.

mysql-test/r/symlink.result

@@ -188,3 +188,28 @@ DROP TABLE user;
 FLUSH TABLE mysql.user;
 SELECT * FROM mysql.user;
 End of 5.1 tests
+#
+# Test for bug #11759990 - "52354: 'CREATE TABLE .. LIKE ... '
+#                           STATEMENTS FAIL".
+#
+drop table if exists t1, t2;
+create table t1 (a int primary key) engine=myisam
+data directory="MYSQLTEST_VARDIR/tmp"
+      index directory="MYSQLTEST_VARDIR/run";
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(11) NOT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 DATA DIRECTORY='MYSQLTEST_VARDIR/tmp/' INDEX DIRECTORY='MYSQLTEST_VARDIR/run/'
+# CREATE TABLE LIKE statement on table with INDEX/DATA DIRECTORY
+# options should not fail. Per documentation newly created table
+# should not inherit value of these options from the original table.
+create table t2 like t1;
+show create table t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `a` int(11) NOT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop tables t1, t2;

mysql-test/t/symlink.test

@@ -277,3 +277,24 @@ SELECT * FROM mysql.user;
 --remove_file $MYSQL_TMP_DIR/mysql
 
 --echo End of 5.1 tests
+
+
+--echo #
+--echo # Test for bug #11759990 - "52354: 'CREATE TABLE .. LIKE ... '
+--echo #                           STATEMENTS FAIL".
+--echo #
+--disable_warnings
+drop table if exists t1, t2;
+--enable_warnings
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+eval create table t1 (a int primary key) engine=myisam
+      data directory="$MYSQLTEST_VARDIR/tmp"
+      index directory="$MYSQLTEST_VARDIR/run";
+--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
+show create table t1;
+--echo # CREATE TABLE LIKE statement on table with INDEX/DATA DIRECTORY
+--echo # options should not fail. Per documentation newly created table
+--echo # should not inherit value of these options from the original table.
+create table t2 like t1;
+show create table t2;
+drop tables t1, t2;

sql/sql_table.cc

@@ -4582,6 +4582,11 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table, TABLE_LIST* src_table,
   local_create_info.options|= create_info->options & HA_LEX_CREATE_TMP_TABLE;
   /* Reset auto-increment counter for the new table. */
   local_create_info.auto_increment_value= 0;
+  /*
+    Do not inherit values of DATA and INDEX DIRECTORY options from
+    the original table. This is documented behavior.
+  */
+  local_create_info.data_file_name= local_create_info.index_file_name= NULL;
 
   if ((res= mysql_create_table_no_lock(thd, table->db, table->table_name,
                                        &local_create_info, &local_alter_info,