Bug#30152 MySQLD crash duing alter table causes DROP DATABASE to FAIL due to temp file

disable decoding of table name if the table is internal temporary table

mysql-test/r/drop.result

@@ -85,3 +85,8 @@ select 1;
 1
 unlock tables;
 End of 5.0 tests
+create database mysql_test;
+create table mysql_test.t1(f1 int);
+create table mysql_test.`#sql-347f_7` (f1 int);
+drop database mysql_test;
+End of 5.1 tests

mysql-test/t/drop.test

@@ -122,3 +122,16 @@ disconnect addconroot2;
 connection default;
 
 --echo End of 5.0 tests
+
+#
+# Bug#30152 MySQLD crash duing alter table causes DROP DATABASE to FAIL due to temp file
+#
+create database mysql_test;
+create table mysql_test.t1(f1 int);
+create table mysql_test.`#sql-347f_7` (f1 int);
+create table mysql_test.`#sql-347f_8` (f1 int);
+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;
+
+--echo End of 5.1 tests

sql/sql_db.cc

@@ -1111,6 +1111,7 @@ static long mysql_rm_known_files(THD *thd, MY_DIR *dirp, const char *db,
       VOID(filename_to_tablename(file->name, table_list->table_name,
                                  strlen(file->name) + 1));
       table_list->alias= table_list->table_name;	// If lower_case_table_names=2
+      table_list->internal_tmp_table= is_prefix(file->name, tmp_file_prefix);
       /* Link into list */
       (*tot_list_next)= table_list;
       tot_list_next= &table_list->next_local;

sql/sql_table.cc

@@ -1663,8 +1663,9 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
       }
       alias= (lower_case_table_names == 2) ? table->alias : table->table_name;
       /* remove .frm file and engine files */
-      path_length= build_table_filename(path, sizeof(path),
-                                        db, alias, reg_ext, 0);
+      path_length= build_table_filename(path, sizeof(path), db, alias, reg_ext,
+                                        table->internal_tmp_table ?
+                                        FN_IS_TMP : 0);
     }
     if (drop_temporary ||
         (table_type == NULL &&        

sql/table.h

@@ -1081,6 +1081,7 @@ struct TABLE_LIST
     ... SELECT implementation).
   */
   bool          create;
+  bool          internal_tmp_table;
 
 
   /* View creation context. */