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fd247cc21f
This patch also fixes:
MDEV-33050 Build-in schemas like oracle_schema are accent insensitive
MDEV-33084 LASTVAL(t1) and LASTVAL(T1) do not work well with lower-case-table-names=0
MDEV-33085 Tables T1 and t1 do not work well with ENGINE=CSV and lower-case-table-names=0
MDEV-33086 SHOW OPEN TABLES IN DB1 -- is case insensitive with lower-case-table-names=0
MDEV-33088 Cannot create triggers in the database `MYSQL`
MDEV-33103 LOCK TABLE t1 AS t2 -- alias is not case sensitive with lower-case-table-names=0
MDEV-33109 DROP DATABASE MYSQL -- does not drop SP with lower-case-table-names=0
MDEV-33110 HANDLER commands are case insensitive with lower-case-table-names=0
MDEV-33119 User is case insensitive in INFORMATION_SCHEMA.VIEWS
MDEV-33120 System log table names are case insensitive with lower-cast-table-names=0
- Removing the virtual function strnncoll() from MY_COLLATION_HANDLER
- Adding a wrapper function CHARSET_INFO::streq(), to compare
two strings for equality. For now it calls strnncoll() internally.
In the future it will turn into a virtual function.
- Adding new accent sensitive case insensitive collations:
- utf8mb4_general1400_as_ci
- utf8mb3_general1400_as_ci
They implement accent sensitive case insensitive comparison.
The weight of a character is equal to the code point of its
upper case variant. These collations use Unicode-14.0.0 casefolding data.
The result of
my_charset_utf8mb3_general1400_as_ci.strcoll()
is very close to the former
my_charset_utf8mb3_general_ci.strcasecmp()
There is only a difference in a couple dozen rare characters, because:
- the switch from "tolower" to "toupper" comparison, to make
utf8mb3_general1400_as_ci closer to utf8mb3_general_ci
- the switch from Unicode-3.0.0 to Unicode-14.0.0
This difference should be tolarable. See the list of affected
characters in the MDEV description.
Note, utf8mb4_general1400_as_ci correctly handles non-BMP characters!
Unlike utf8mb4_general_ci, it does not treat all BMP characters
as equal.
- Adding classes representing names of the file based database objects:
Lex_ident_db
Lex_ident_table
Lex_ident_trigger
Their comparison collation depends on the underlying
file system case sensitivity and on --lower-case-table-names
and can be either my_charset_bin or my_charset_utf8mb3_general1400_as_ci.
- Adding classes representing names of other database objects,
whose names have case insensitive comparison style,
using my_charset_utf8mb3_general1400_as_ci:
Lex_ident_column
Lex_ident_sys_var
Lex_ident_user_var
Lex_ident_sp_var
Lex_ident_ps
Lex_ident_i_s_table
Lex_ident_window
Lex_ident_func
Lex_ident_partition
Lex_ident_with_element
Lex_ident_rpl_filter
Lex_ident_master_info
Lex_ident_host
Lex_ident_locale
Lex_ident_plugin
Lex_ident_engine
Lex_ident_server
Lex_ident_savepoint
Lex_ident_charset
engine_option_value::Name
- All the mentioned Lex_ident_xxx classes implement a method streq():
if (ident1.streq(ident2))
do_equal();
This method works as a wrapper for CHARSET_INFO::streq().
- Changing a lot of "LEX_CSTRING name" to "Lex_ident_xxx name"
in class members and in function/method parameters.
- Replacing all calls like
system_charset_info->coll->strcasecmp(ident1, ident2)
to
ident1.streq(ident2)
- Taking advantage of the c++11 user defined literal operator
for LEX_CSTRING (see m_strings.h) and Lex_ident_xxx (see lex_ident.h)
data types. Use example:
const Lex_ident_column primary_key_name= "PRIMARY"_Lex_ident_column;
is now a shorter version of:
const Lex_ident_column primary_key_name=
Lex_ident_column({STRING_WITH_LEN("PRIMARY")});
92 lines
3.1 KiB
C++
92 lines
3.1 KiB
C++
#ifndef SQL_SCHEMA_H_INCLUDED
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#define SQL_SCHEMA_H_INCLUDED
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/*
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Copyright (c) 2020, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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#include "mysqld.h"
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#include "lex_string.h"
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class Lex_ident_sys;
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class Create_func;
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class Schema
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{
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const Lex_ident_db m_name;
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public:
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Schema(const LEX_CSTRING &name)
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:m_name(name)
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{ }
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virtual ~Schema() = default;
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const Lex_ident_db &name() const { return m_name; }
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virtual const Type_handler *map_data_type(THD *thd, const Type_handler *src)
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const
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{
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return src;
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}
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/**
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Find a native function builder, return an error if not found,
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build an Item otherwise.
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*/
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Item *make_item_func_call_native(THD *thd,
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const Lex_ident_routine &name,
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List<Item> *args) const;
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/**
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Find the native function builder associated with a given function name.
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@param thd The current thread
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@param name The native function name
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@return The native function builder associated with the name, or NULL
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*/
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virtual Create_func *find_native_function_builder(THD *thd,
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const LEX_CSTRING &name)
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const;
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// Builders for native SQL function with a special syntax in sql_yacc.yy
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virtual Item *make_item_func_replace(THD *thd,
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Item *subj,
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Item *find,
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Item *replace) const;
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virtual Item *make_item_func_substr(THD *thd,
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const Lex_substring_spec_st &spec) const;
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virtual Item *make_item_func_trim(THD *thd, const Lex_trim_st &spec) const;
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/*
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For now we have *hard-coded* compatibility schemas:
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schema_mariadb, schema_oracle, schema_maxdb.
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But eventually we'll turn then into real databases on disk.
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So the code below compares names according to the filesystem
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case sensitivity, like it is done for regular databases.
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Note, this is different to information_schema, whose name
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is always case insensitive. This is intentional!
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The assymetry will be gone when we'll implement SQL standard
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regular and delimited identifiers.
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*/
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bool eq_name(const LEX_CSTRING &name) const
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{
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return m_name.streq(name);
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}
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static Schema *find_by_name(const LEX_CSTRING &name);
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static Schema *find_implied(THD *thd);
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};
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extern Schema mariadb_schema;
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extern const Schema &oracle_schema_ref;
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#endif // SQL_SCHEMA_H_INCLUDED
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