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MDEV-12459 Patch sysschema

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This commit updates sysschema to work with the new behaviour of show
tables and information_schema.tables table showing temporary tables for
current connection.

Co-authored-by: Monty <monty@mariadb.org>
Reviewer: <vicentiu@mariadb.org>
This commit is contained in:
Anel Husakovic
2023-06-07 13:23:25 +02:00
committed by Sergei Golubchik
parent 0b7d1748ad
commit 1923ff8e41
3 changed files with 287 additions and 77 deletions
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137
scripts/sys_schema/procedures/table_exists.sql
View File

@ -19,7 +19,7 @@ DELIMITER $$
CREATE DEFINER='mariadb.sys'@'localhost' PROCEDURE table_exists (
IN in_db VARCHAR(64), IN in_table VARCHAR(64),
OUT out_exists ENUM('', 'BASE TABLE', 'VIEW', 'TEMPORARY', 'SEQUENCE', 'SYSTEM VIEW')
OUT out_exists ENUM('', 'BASE TABLE', 'VIEW', 'TEMPORARY', 'SEQUENCE', 'SYSTEM VIEW', 'TEMPORARY SEQUENCE')
)
COMMENT '
Description
@ -39,36 +39,44 @@ CREATE DEFINER='mariadb.sys'@'localhost' PROCEDURE table_exists (
in_table (VARCHAR(64)):
The name of the table to check the existence of.
out_exists ENUM('''', ''BASE TABLE'', ''VIEW'', ''TEMPORARY''):
out_exists ENUM('''', ''BASE TABLE'', ''VIEW'', ''TEMPORARY'', ''SEQUENCE'', ''SYSTEM VIEW'', ''TEMPORARY SEQUENCE''):
The return value: whether the table exists. The value is one of:
* '''' - the table does not exist neither as a base table, view, sequence nor temporary table.
* ''BASE TABLE'' - the table name exists as a permanent base table table.
* ''VIEW'' - the table name exists as a view.
* ''TEMPORARY'' - the table name exists as a temporary table.
* ''SEQUENCE'' - the table name exists as a sequence.
* ''SYSTEM VIEW'' - the table name exists as a system view.
* '''' - the table does not exist neither as a base table, view, sequence nor temporary table/sequence.
* ''BASE TABLE'' - the table name exists as a permanent base table table.
* ''VIEW'' - the table name exists as a view.
* ''TEMPORARY'' - the table name exists as a temporary table.
* ''SEQUENCE'' - the table name exists as a sequence.
* ''SYSTEM VIEW'' - the table name exists as a system view.
* ''TEMPORARY SEQUENCE'' - the table name exists as a temporary sequence.
Example
--------
mysql> CREATE DATABASE db1;
MariaDB [sys]> CREATE DATABASE db1;
Query OK, 1 row affected (0.07 sec)
mysql> use db1;
MariaDB [sys]> use db1;
Database changed
mysql> CREATE TABLE t1 (id INT PRIMARY KEY);
MariaDB [sys]> CREATE TABLE t1 (id INT PRIMARY KEY);
Query OK, 0 rows affected (0.08 sec)
mysql> CREATE TABLE t2 (id INT PRIMARY KEY);
MariaDB [sys]> CREATE TABLE t2 (id INT PRIMARY KEY);
Query OK, 0 rows affected (0.08 sec)
mysql> CREATE view v_t1 AS SELECT * FROM t1;
MariaDB [sys]> CREATE view v_t1 AS SELECT * FROM t1;
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE TEMPORARY TABLE t1 (id INT PRIMARY KEY);
MariaDB [sys]> CREATE TEMPORARY TABLE t1 (id INT PRIMARY KEY);
Query OK, 0 rows affected (0.00 sec)
mysql> CALL sys.table_exists(''db1'', ''t1'', @exists); SELECT @exists;
MariaDB [sys]> CREATE SEQUENCE s;
Query OK, 0 rows affected (0.00 sec)
MariaDB [sys]> CREATE TEMPORARY SEQUENCE s_temp;
Query OK, 0 rows affected (0.00 sec)
MariaDB [sys]> CALL sys.table_exists(''db1'', ''t1'', @exists); SELECT @exists;
Query OK, 0 rows affected (0.00 sec)
+------------+
@ -78,7 +86,7 @@ CREATE DEFINER='mariadb.sys'@'localhost' PROCEDURE table_exists (
+------------+
1 row in set (0.00 sec)
mysql> CALL sys.table_exists(''db1'', ''t2'', @exists); SELECT @exists;
MariaDB [sys]> CALL sys.table_exists(''db1'', ''t2'', @exists); SELECT @exists;
Query OK, 0 rows affected (0.00 sec)
+------------+
@ -88,7 +96,7 @@ CREATE DEFINER='mariadb.sys'@'localhost' PROCEDURE table_exists (
+------------+
1 row in set (0.01 sec)
mysql> CALL sys.table_exists(''db1'', ''v_t1'', @exists); SELECT @exists;
MariaDB [sys]> CALL sys.table_exists(''db1'', ''v_t1'', @exists); SELECT @exists;
Query OK, 0 rows affected (0.00 sec)
+---------+
@ -118,7 +126,7 @@ CREATE DEFINER='mariadb.sys'@'localhost' PROCEDURE table_exists (
+-------------+
1 row in set (0.001 sec)
mysql> CALL sys.table_exists(''db1'', ''t3'', @exists); SELECT @exists;
MariaDB [sys]> CALL sys.table_exists(''db1'', ''t3'', @exists); SELECT @exists;
Query OK, 0 rows affected (0.01 sec)
+---------+
@ -127,6 +135,16 @@ CREATE DEFINER='mariadb.sys'@'localhost' PROCEDURE table_exists (
| |
+---------+
1 row in set (0.00 sec)
MariaDB [sys]> CALL table_exists(''db1'', ''s_temp'', @exists); SELECT @exists;
Query OK, 0 rows affected (0.003 sec)
+--------------------+
| @exists |
+--------------------+
| TEMPORARY SEQUENCE |
+--------------------+
1 row in set (0.001 sec)
'
SQL SECURITY INVOKER
NOT DETERMINISTIC
@ -135,65 +153,32 @@ BEGIN
DECLARE v_error BOOLEAN DEFAULT FALSE;
DECLARE db_quoted VARCHAR(64);
DECLARE table_quoted VARCHAR(64);
DECLARE v_table_type VARCHAR(16) DEFAULT '';
DECLARE v_system_db BOOLEAN
DEFAULT LOWER(in_db) IN ('information_schema', 'performance_schema');
DECLARE v_table_type VARCHAR(30) DEFAULT '';
DECLARE v_table_type_num INT;
DECLARE CONTINUE HANDLER FOR 1050 SET v_error = TRUE;
DECLARE CONTINUE HANDLER FOR 1146 SET v_error = TRUE;
SET out_exists = '';
SET db_quoted = sys.quote_identifier(in_db);
SET table_quoted = sys.quote_identifier(in_table);
-- First check do we have multiple rows, what can happen if temporary table
-- and/or sequence is shadowing base table for example.
-- In such scenario return temporary.
SET v_table_type_num = (SELECT COUNT(TABLE_TYPE) FROM information_schema.TABLES WHERE
TABLE_SCHEMA = in_db AND TABLE_NAME = in_table);
-- Verify whether the table name exists as a normal table
IF (EXISTS(SELECT 1 FROM information_schema.TABLES WHERE TABLE_SCHEMA = in_db AND TABLE_NAME = in_table)) THEN
-- Unfortunately the only way to determine whether there is also a temporary table is to try to create
-- a temporary table with the same name. If it succeeds the table didn't exist as a temporary table.
IF v_system_db = FALSE THEN
SET @sys.tmp.table_exists.SQL = CONCAT('CREATE TEMPORARY TABLE ',
db_quoted,
'.',
table_quoted,
'(id INT PRIMARY KEY)');
PREPARE stmt_create_table FROM @sys.tmp.table_exists.SQL;
EXECUTE stmt_create_table;
DEALLOCATE PREPARE stmt_create_table;
-- The temporary table was created, i.e. it didn't exist. Remove it again so we don't leave garbage around.
SET @sys.tmp.table_exists.SQL = CONCAT('DROP TEMPORARY TABLE ',
db_quoted,
'.',
table_quoted);
PREPARE stmt_drop_table FROM @sys.tmp.table_exists.SQL;
EXECUTE stmt_drop_table;
DEALLOCATE PREPARE stmt_drop_table;
END IF;
IF (v_error) THEN
SET out_exists = 'TEMPORARY';
ELSE
SET v_table_type = (SELECT TABLE_TYPE FROM information_schema.TABLES WHERE TABLE_SCHEMA = in_db AND TABLE_NAME = in_table);
-- Don't fail on table_type='SYSTEM VERSIONED'
-- but return 'BASE TABLE' for compatibility with existing tooling
IF v_table_type = 'SYSTEM VERSIONED' THEN
SET out_exists = 'BASE TABLE';
ELSE
SET out_exists = v_table_type;
END IF;
END IF;
IF v_table_type_num > 1 THEN
SET out_exists = 'TEMPORARY';
ELSE
-- Check whether a temporary table exists with the same name.
-- If it does it's possible to SELECT from the table without causing an error.
-- If it does not exist even a PREPARE using the table will fail.
IF v_system_db = FALSE THEN
SET @sys.tmp.table_exists.SQL = CONCAT('SELECT COUNT(*) FROM ',
db_quoted,
'.',
table_quoted);
PREPARE stmt_select FROM @sys.tmp.table_exists.SQL;
IF (NOT v_error) THEN
DEALLOCATE PREPARE stmt_select;
SET out_exists = 'TEMPORARY';
END IF;
SET v_table_type = (SELECT TABLE_TYPE FROM information_schema.TABLES WHERE
TABLE_SCHEMA = in_db AND TABLE_NAME = in_table);
IF v_table_type is NULL
THEN
SET v_table_type='';
END IF;
-- Don't fail on table_type='SYSTEM VERSIONED'
-- but return 'BASE TABLE' for compatibility with existing tooling
IF v_table_type = 'SYSTEM VERSIONED' THEN
SET out_exists = 'BASE TABLE';
ELSE
SET out_exists = v_table_type;
END IF;
END IF;
END$$