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+#ifndef SQL_SCHEMA_H_INCLUDED
+#define SQL_SCHEMA_H_INCLUDED
+/*
+ Copyright (c) 2020, MariaDB Corporation.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
+
+#include "mysqld.h"
+#include "lex_string.h"
+
+class Schema
+{
+ LEX_CSTRING m_name;
+public:
+ Schema(const LEX_CSTRING &name)
+ :m_name(name)
+ { }
+ virtual ~Schema() { }
+ const LEX_CSTRING &name() const { return m_name; }
+ virtual const Type_handler *map_data_type(THD *thd, const Type_handler *src)
+ const
+ {
+ return src;
+ }
+ /*
+ For now we have *hard-coded* compatibility schemas:
+ schema_mariadb, schema_oracle, schema_maxdb.
+ But eventually we'll turn then into real databases on disk.
+ So the code below compares names according to the filesystem
+ case sensitivity, like it is done for regular databases.
+
+ Note, this is different to information_schema, whose name
+ is always case insensitive. This is intentional!
+ The assymetry will be gone when we'll implement SQL standard
+ regular and delimited identifiers.
+ */
+ bool eq_name(const LEX_CSTRING &name) const
+ {
+#if MYSQL_VERSION_ID > 100500
+#error Remove the old code
+ return !table_alias_charset->strnncoll(m_name.str, m_name.length,
+ name.str, name.length);
+#else
+ // Please remove this when merging to 10.5
+ return !table_alias_charset->coll->strnncoll(table_alias_charset,
+ (const uchar *) m_name.str,
+ m_name.length,
+ (const uchar *) name.str,
+ name.length, FALSE);
+#endif
+ }
+ static Schema *find_by_name(const LEX_CSTRING &name);
+ static Schema *find_implied(THD *thd);
+};
+
+
+extern Schema mariadb_schema;
+
+#endif // SQL_SCHEMA_H_INCLUDED