Bug#26703: DROP DATABASE fails if database contains a #mysql50# \

	table with backticks

(Thanks to Lu Jingdong, though I did not take his patch directly, as
it contained a significant flaw.)

It wasn't a backtick/parsing problem.  We merely didn't anticipate
and allocate enough space to handle the optional "#mysql50#" table-
name prefix. 

Now, allocate that extra space in case we need it when we look up 
a legacy table to get its file's name.


mysql-test/r/drop.result:
  Verify that databases with old-style files can be removed.
mysql-test/t/drop.test:
  Verify that databases with old-style files can be removed.
sql/sql_db.cc:
  Extend the size of the memory that holds the table's name, so that
  the legacy "mysql50" prefix fits.

1 files changed, 15 insertions, 0 deletions

diff --git a/mysql-test/t/drop.test b/mysql-test/t/drop.test
index a79044436eb..ad26287a666 100644
--- a/mysql-test/t/drop.test
+++ b/mysql-test/t/drop.test
@@ -134,4 +134,19 @@ drop table mysql_test.`#sql-347f_8`;
 copy_file $MYSQLTEST_VARDIR/master-data/mysql_test/t1.frm $MYSQLTEST_VARDIR/master-data/mysql_test/#sql-347f_6.frm;
 drop database mysql_test;
 
+#
+# Bug#26703: DROP DATABASE fails if database contains a #mysql50# table with backticks
+#
+create database mysqltestbug26703;
+use mysqltestbug26703;
+create table `#mysql50#abc``def` ( id int );
+--error ER_WRONG_TABLE_NAME
+create table `aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa` (a int);
+create table `aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa` (a int);
+create table `#mysql50#aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa` (a int);
+--error ER_WRONG_TABLE_NAME
+create table `#mysql50#aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa` (a int);
+use test;
+drop database mysqltestbug26703;
+
 --echo End of 5.1 tests